Phase 3 section
Pokémon HeartGold & SoulSilver Union Cave Walkthrough
Hive Badge Clear the main floor and record Surf-only lower routes. Exact HGSS encounters, trainers, items, puzzle route, version differences, and completion checks.
Clear the main floor and record Surf-only lower routes. This combined guide never substitutes original Gold/Silver or Crystal data for the Nintendo DS remakes.
Source maps
Union Cave 1F, Union Cave B1F, Union Cave B2F.
Encounter rows76Trainer rows12Visible / hidden / trees8 / 7 / 0
Version scope
HeartGold and SoulSilver are labeled per row. Event-only and external-device content is never presented as normal retail progression.
Route Plan
Take both 1F branches, defeat every trainer, collect the item balls, and exit toward Route 33. Return on Friday with Surf for Lapras and later with Waterfall for the deepest chamber.
Wild Pokémon
Version:
Each area below has its own table, split by encounter method. Standard rates merge every base slot for a species and are shown per time window: morning 04:00-09:59, day 10:00-19:59, night 20:00-03:59. Swarm, radio-broadcast, and Headbutt tables keep their own labeled rows, and every row carries HG/SS markers. Underlying slot odds: grass 20/20/10/10/10/10/5/5/4/4/1/1; Surf 60/30/5/4/1; Rods 40/30/15/10/5; Rock Smash 80/20; Headbutt 50/15/15/10/5/5.
Union Cave 1F
| Pokémon | Games | Levels | Rate | Requirement / notes | ||
|---|---|---|---|---|---|---|
| Morning | Day | Night | ||||
| Grass / cave floor | ||||||
 Geodude | HGSS | 6 | 30% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
 Rattata | HGSS | 6 | 30% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
 Sandshrew | HGSS | 6 | 30% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
 Zubat | HGSS | 5 or 7 | 25% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Rattata | HGSS | 4 | 10% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
 Onix | HGSS | 6 | 5% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Swarm (post-National Dex daily announcement) | ||||||
 Magikarp | HGSS | 40 | 100% | Super Rod. Post-National Dex swarm replacement. | ||
| Magikarp | HGSS | 20 | 65% | Good Rod. Post-National Dex swarm replacement. | ||
 Wooper | HGSS | 10-20 | 60% | Surf. Post-National Dex swarm replacement. | ||
| Geodude | HGSS | 6 | 40% | Post-National Dex swarm replacement. | ||
| Magikarp | HGSS | 10 | 15% | Old Rod. Post-National Dex swarm replacement. | ||
| Radio — Hoenn Sound (Wednesday, post-National Dex) | ||||||
 Absol | HGSS | 5-6 | 20% | Hoenn Sound on Wednesday after the National Dex; replaces grass slots 2-5. | ||
 Makuhita | HGSS | 5-6 | 20% | Hoenn Sound on Wednesday after the National Dex; replaces grass slots 2-5. | ||
| Radio — Sinnoh Sound (Thursday, post-National Dex) | ||||||
 Bronzor | HGSS | 5-6 | 20% | Sinnoh Sound on Thursday after the National Dex; replaces grass slots 2-5. | ||
 Chingling | HGSS | 5-6 | 20% | Sinnoh Sound on Thursday after the National Dex; replaces grass slots 2-5. | ||
| Surfing | ||||||
| Wooper | HGSS | 10-20 | 60% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
 Quagsire | HGSS | 10-25 | 40% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Fishing — Old Rod | ||||||
| Magikarp | HGSS | 10 | 85% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
 Goldeen | HGSS | 10 | 15% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Fishing — Good Rod | ||||||
| Goldeen | HGSS | 20 | 60% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Magikarp | HGSS | 20 | 40% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Fishing — Super Rod | ||||||
| Goldeen | HGSS | 40 | 70% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Magikarp | HGSS | 40 | 20% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
 Seaking | HGSS | 40 | 10% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
Union Cave B1F
| Pokémon | Games | Levels | Rate | Requirement / notes | ||
|---|---|---|---|---|---|---|
| Morning | Day | Night | ||||
| Grass / cave floor | ||||||
| Geodude | HGSS | 8 | 30% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Rattata | HGSS | 8 | 30% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Sandshrew | HGSS | 8 | 30% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Zubat | HGSS | 7 or 9 | 25% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Onix | HGSS | 8 | 10% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Rattata | HGSS | 6 | 5% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Swarm (post-National Dex daily announcement) | ||||||
| Magikarp | HGSS | 40 | 100% | Super Rod. Post-National Dex swarm replacement. | ||
| Magikarp | HGSS | 20 | 65% | Good Rod. Post-National Dex swarm replacement. | ||
| Wooper | HGSS | 10-20 | 60% | Surf. Post-National Dex swarm replacement. | ||
| Geodude | HGSS | 8 | 40% | Post-National Dex swarm replacement. | ||
| Magikarp | HGSS | 10 | 15% | Old Rod. Post-National Dex swarm replacement. | ||
| Radio — Hoenn Sound (Wednesday, post-National Dex) | ||||||
| Absol | HGSS | 7-8 | 20% | Hoenn Sound on Wednesday after the National Dex; replaces grass slots 2-5. | ||
| Makuhita | HGSS | 7-8 | 20% | Hoenn Sound on Wednesday after the National Dex; replaces grass slots 2-5. | ||
| Radio — Sinnoh Sound (Thursday, post-National Dex) | ||||||
| Bronzor | HGSS | 7-8 | 20% | Sinnoh Sound on Thursday after the National Dex; replaces grass slots 2-5. | ||
| Chingling | HGSS | 7-8 | 20% | Sinnoh Sound on Thursday after the National Dex; replaces grass slots 2-5. | ||
| Surfing | ||||||
| Wooper | HGSS | 10-20 | 60% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Quagsire | HGSS | 10-25 | 40% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Fishing — Old Rod | ||||||
| Magikarp | HGSS | 10 | 85% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Goldeen | HGSS | 10 | 15% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Fishing — Good Rod | ||||||
| Goldeen | HGSS | 20 | 60% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Magikarp | HGSS | 20 | 40% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Fishing — Super Rod | ||||||
| Goldeen | HGSS | 40 | 70% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Magikarp | HGSS | 40 | 20% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Seaking | HGSS | 40 | 10% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
Union Cave B2F
| Pokémon | Games | Levels | Rate | Requirement / notes | ||
|---|---|---|---|---|---|---|
| Morning | Day | Night | ||||
| Grass / cave floor | ||||||
 Raticate | HGSS | 22 | 30% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Zubat | HGSS | 22 | 30% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
 Golbat | HGSS | 22 | 20% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Geodude | HGSS | 21 | 10% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Onix | HGSS | 23 | 5% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Rattata | HGSS | 20 | 5% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
| Swarm (post-National Dex daily announcement) | ||||||
| Magikarp | HGSS | 40 | 100% | Super Rod. Post-National Dex swarm replacement. | ||
| Magikarp | HGSS | 20 | 65% | Good Rod. Post-National Dex swarm replacement. | ||
 Tentacool | HGSS | 10-20 | 60% | Surf. Post-National Dex swarm replacement. | ||
| Zubat | HGSS | 22 | 40% | Post-National Dex swarm replacement. | ||
| Magikarp | HGSS | 10 | 15% | Old Rod. Post-National Dex swarm replacement. | ||
| Radio — Hoenn Sound (Wednesday, post-National Dex) | ||||||
| Absol | HGSS | 22 | 20% | Hoenn Sound on Wednesday after the National Dex; replaces grass slots 2-5. | ||
| Makuhita | HGSS | 22 | 20% | Hoenn Sound on Wednesday after the National Dex; replaces grass slots 2-5. | ||
| Radio — Sinnoh Sound (Thursday, post-National Dex) | ||||||
| Bronzor | HGSS | 22 | 20% | Sinnoh Sound on Thursday after the National Dex; replaces grass slots 2-5. | ||
| Chingling | HGSS | 22 | 20% | Sinnoh Sound on Thursday after the National Dex; replaces grass slots 2-5. | ||
| Surfing | ||||||
| Tentacool | HGSS | 10-20 | 60% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Quagsire | HGSS | 15-25 | 30% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
 Tentacruel | HGSS | 15-25 | 10% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Fishing — Old Rod | ||||||
| Magikarp | HGSS | 10 | 85% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
 Krabby | HGSS | 10 | 15% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Fishing — Good Rod | ||||||
| Krabby | HGSS | 20 | 50% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Magikarp | HGSS | 20 | 40% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
 Corsola | HGSS | 20 | 10% | 10% | — | Rate counts base slots temporarily replaced by the announced daily swarm. |
 Staryu | HGSS | 20 | — | — | 10% | Rate counts base slots temporarily replaced by the announced daily swarm. |
| Fishing — Super Rod | ||||||
| Krabby | HGSS | 40 | 60% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Corsola | HGSS | 40 | 30% | 30% | — | Rate counts base slots temporarily replaced by the announced daily swarm. |
| Staryu | HGSS | 40 | — | — | 30% | Rate counts base slots temporarily replaced by the announced daily swarm. |
 Kingler | HGSS | 40 | 10% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
Static, gift, trade, and event Pokémon
| Pokémon | Method | Level | Requirement / note |
|---|---|---|---|
 Lapras | Static encounter | Lv. 20 | Source-scripted encounter or gift; save or make party space before resolving it. |
| Lapras | Static encounter | Lv. 20 | B2F every Friday after Surf; respawns the next Friday if caught or defeated. |
Trainers
Teams are the exact source party records. Moves and held items appear only when the trainer format defines them. Reward = last party member level × 4 × trainer-class multiplier; double battles double the base payout where the engine applies it.
| Trainer | Location / order | Full team | Reward | Battle note |
|---|---|---|---|---|
 Poké Maniac LarrySource trainer ID 23 | Union Cave 1F • source tile (12, 80) |
| ₽704 | Single battle. |
 Hiker RusselSource trainer ID 25 | Union Cave 1F • source tile (20, 51) | ₽256 | Single battle. | |
| Poké Maniac AndrewSource trainer ID 201 | Union Cave B1F • source tile (7, 59) | ₽1,536 | Single battle. | |
| Poké Maniac CalvinSource trainer ID 202 | Union Cave B1F • source tile (26, 58) |
| ₽1,664 | Single battle. |
| Hiker PhillipSource trainer ID 203 | Union Cave B1F • source tile (13, 4) | ₽800 | Single battle. | |
| Hiker LeonardSource trainer ID 204 | Union Cave B1F • source tile (21, 19) | ₽800 | Single battle. | |
 Ace Trainer M NickSource trainer ID 205 | Union Cave B2F • source tile (24, 77) |
| ₽1,560 | Single battle. |
 Ace Trainer F GwenSource trainer ID 206 | Union Cave B2F • source tile (6, 62) | ₽1,320 | Single battle. | |
 Firebreather BillSource trainer ID 319 | Union Cave 1F • source tile (23, 69) | ₽192 | Single battle. | |
| Ace Trainer F EmmaSource trainer ID 363 | Union Cave B2F • source tile (4, 83) |
| ₽1,680 | Single battle. |
| Hiker DanielSource trainer ID 384 | Union Cave 1F • source tile (5, 48) |
| ₽352 | Single battle. |
| Firebreather RaySource trainer ID 390 | Union Cave 1F • source tile (8, 26) |
| ₽288 | Single battle. |
Items And Hidden Items
| Item | Method | Plain-English placement | Source tile |
|---|---|---|---|
| X Attack | Visible item ball | Pick up the item ball in the west part of Union Cave 1F. | 3, 34 |
| Great Ball | Visible item ball | Pick up the item ball in the southeast part of Union Cave 1F. | 29, 72 |
| Potion | Visible item ball | Pick up the item ball in the southwest part of Union Cave 1F. | 4, 67 |
| Awakening | Visible item ball | Pick up the item ball in the southeast part of Union Cave 1F. | 23, 93 |
| TM39 | Visible item ball | Pick up the item ball in the southwest part of Union Cave B1F. | 11, 42 |
| X Defense | Visible item ball | Pick up the item ball in the east part of Union Cave B1F. | 27, 30 |
| Elixir | Visible item ball | Pick up the item ball in the east part of Union Cave B2F. | 25, 43 |
| Hyper Potion | Visible item ball | Pick up the item ball in the south part of Union Cave B2F. | 17, 73 |
| Big Pearl | Hidden / Dowsing MCHN | Use the Dowsing MCHN on the ground in the southwest part of Union Cave 1F, 1 tile west and 7 tiles south from the nearest source NPC. | 3, 74 |
| Great Ball | Hidden / Dowsing MCHN | Use the Dowsing MCHN on the ground in the east part of Union Cave 1F, 1 tile east and 14 tiles north from the nearest source NPC. | 30, 58 |
| Parlyz Heal | Hidden / Dowsing MCHN | Use the Dowsing MCHN on the ground in the south part of Union Cave 1F, 6 tiles east and 4 tiles north from the nearest source NPC. | 18, 76 |
| X Speed | Hidden / Dowsing MCHN | Use the Dowsing MCHN on the ground in the southeast part of Union Cave B1F, 9 tiles east and 1 tile south from the nearest source NPC. | 20, 43 |
| Revive | Hidden / Dowsing MCHN | Use the Dowsing MCHN on the ground in the northeast part of Union Cave B1F, 3 tiles east and 4 tiles north from the nearest source NPC. | 24, 15 |
| Ultra Ball | Hidden / Dowsing MCHN | Use the Dowsing MCHN on the ground in the southwest part of Union Cave B2F, 1 tile west and 2 tiles north from the nearest source NPC. | 3, 81 |
| Calcium | Hidden / Dowsing MCHN | Use the Dowsing MCHN on the ground in the west part of Union Cave B2F, 2 tiles west and 3 tiles north from the nearest source NPC. | 4, 59 |
Puzzles And Systems
Follow the route plan in order; source tiles in the item and trainer tables provide a QA anchor for every placed object.
Completion Checklist
- Visit all 3 mapped source subareas assigned here.
- Account for 78 random, Headbutt, Safari, Contest, static, gift, trade, or event rows across the per-area tables.
- Defeat or deliberately defer all 12 listed trainer records.
- Collect 8 visible items, 7 hidden items, and 0 Apricorn trees assigned here.
- Finish the stated story, puzzle, schedule, version, and event conditions before moving on.
Sources And Validation
- Primary source:
pret/pokeheartgoldcommit814275e4392cc21eef45a04e6dc8d980010ca2b7. - Layers: encounter banks, map headers, trainer parties, field events and scripts, Headbutt, Safari, Bug Contest, hidden items, Apricorns, phone/Pokégear, and Frontier engine data.
- Machine-readable validation report and trainer asset manifest.
Dex quick links