Phase 2 section
Pokémon HeartGold & SoulSilver Route 31 and Dark Cave entrance Walkthrough
Zephyr Badge Finish the road to Violet and mark the Flash-gated cave for cleanup. Exact HGSS encounters, trainers, items, puzzle route, version differences, and completion checks.
Finish the road to Violet and mark the Flash-gated cave for cleanup. This combined guide never substitutes original Gold/Silver or Crystal data for the Nintendo DS remakes.
Source maps
Route 31, Dark Cave Route 31 Side.
Encounter rows61Trainer rows1Visible / hidden / trees7 / 2 / 1
Version scope
HeartGold and SoulSilver are labeled per row. Event-only and external-device content is never presented as normal retail progression.
Route Plan
Clear the Route 31 trainers and Apricorn tree, take the visible items, inspect Dark Cave's Route 31 side, and stop before blind exploration unless the encounter table is the goal.
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.
Dark Cave Route 31 Side
| Pokémon | Games | Levels | Rate | Requirement / notes | ||
|---|---|---|---|---|---|---|
| Morning | Day | Night | ||||
| Grass / cave floor | ||||||
 Geodude | HGSS | 2-4 | 60% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
 Zubat | HGSS | 2-4 | 39% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
 Dunsparce | HGSS | 4 | 1% | 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. | ||
| Magikarp | HGSS | 10-20 | 60% | Surf. Post-National Dex swarm replacement. | ||
| Dunsparce | HGSS | 2-3 | 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 | 2-3 | 20% | Hoenn Sound on Wednesday after the National Dex; replaces grass slots 2-5. | ||
 Makuhita | HGSS | 2 | 20% | Hoenn Sound on Wednesday after the National Dex; replaces grass slots 2-5. | ||
| Radio — Sinnoh Sound (Thursday, post-National Dex) | ||||||
 Bronzor | HGSS | 2-3 | 20% | Sinnoh Sound on Thursday after the National Dex; replaces grass slots 2-5. | ||
 Chingling | HGSS | 2 | 20% | Sinnoh Sound on Thursday after the National Dex; replaces grass slots 2-5. | ||
| Surfing | ||||||
| Magikarp | HGSS | 2-20 | 100% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Rock Smash | ||||||
| Dunsparce | HGSS | 4-8 | 80% | — | ||
| Geodude | HGSS | 8-14 | 20% | — | ||
| 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. | ||
Route 31
| Pokémon | Games | Levels | Rate | Requirement / notes | ||
|---|---|---|---|---|---|---|
| Morning | Day | Night | ||||
| Grass / cave floor | ||||||
 Rattata | HGSS | 4-5 | — | — | 40% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. |
 Caterpie | HGSS | 4-5 | 35% | 35% | — | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. |
 Weedle | HGSS | 4-5 | 30% | 35% | — | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. |
 Hoothoot | HGSS | 4 | — | — | 30% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. |
 Ledyba | HGSS | 4 | 30% | — | — | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. |
 Pidgey | HGSS | 3 | 30% | 30% | — | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. |
| Pidgey | HGSS | 4-5 | 10% | 30% | — | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. |
 Spinarak | HGSS | 3 | — | — | 30% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. |
 Bellsprout | HGSS | 3 | 20% | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. | ||
 Kakuna | HGSS | 5 | 10% | 15% | — | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. |
 Metapod | HGSS | 5 | 15% | 15% | — | Rate counts base slots temporarily replaced by the announced daily swarm, Wednesday's Hoenn Sound broadcast, and Thursday's Sinnoh Sound broadcast. |
| Hoothoot | HGSS | 5 | — | — | 10% | 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. | ||
 Poliwag | HGSS | 15-25 | 60% | Surf. Post-National Dex swarm replacement. | ||
| Ledyba | HGSS | 4 | 40% | Post-National Dex swarm replacement. | ||
| Pidgey | HGSS | 3-4 | 40% | Post-National Dex swarm replacement. | ||
| Magikarp | HGSS | 10 | 15% | Old Rod. Post-National Dex swarm replacement. | ||
| Radio — Hoenn Sound (Wednesday, post-National Dex) | ||||||
 Linoone | HGSS | 3-4 | 20% | Hoenn Sound on Wednesday after the National Dex; replaces grass slots 2-5. | ||
 Whismur | HGSS | 3 | 20% | Hoenn Sound on Wednesday after the National Dex; replaces grass slots 2-5. | ||
| Whismur | HGSS | 3-4 | 20% | Hoenn Sound on Wednesday after the National Dex; replaces grass slots 2-5. | ||
| Radio — Sinnoh Sound (Thursday, post-National Dex) | ||||||
 Bidoof | HGSS | 3-4 | 20% | Sinnoh Sound on Thursday after the National Dex; replaces grass slots 2-5. | ||
 Buizel | HGSS | 3 | 20% | Sinnoh Sound on Thursday after the National Dex; replaces grass slots 2-5. | ||
| Buizel | HGSS | 3-4 | 20% | Sinnoh Sound on Thursday after the National Dex; replaces grass slots 2-5. | ||
| Surfing | ||||||
| Poliwag | HGSS | 10-25 | 90% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
 Poliwhirl | HGSS | 15-25 or 32 | 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. | ||
| Poliwag | HGSS | 10 | 15% | Rate counts base slots temporarily replaced by the announced daily swarm. | ||
| Fishing — Good Rod | ||||||
| Poliwag | 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 | ||||||
| Poliwag | HGSS | 40 | 80% | 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. | ||
| Headbutt — common tree table | ||||||
| Hoothoot | HGSS | 3-4 | 50% | Common Headbutt table; regular-tree selection depends on Trainer ID and tree group. | ||
 Pineco | HGSS | 3-4 | 30% | Common Headbutt table; regular-tree selection depends on Trainer ID and tree group. | ||
 Exeggcute | HGSS | 3-4 | 20% | Common Headbutt table; regular-tree selection depends on Trainer ID and tree group. | ||
| Headbutt — rare tree table | ||||||
| Hoothoot | HGSS | 5-6 | 50% | Rare Headbutt table; regular-tree selection depends on Trainer ID and tree group. | ||
| Ledyba | HGSS | 5-6 | 30% | Rare Headbutt table; regular-tree selection depends on Trainer ID and tree group. | ||
| Spinarak | HGSS | 5-6 | 30% | Rare Headbutt table; regular-tree selection depends on Trainer ID and tree group. | ||
| Exeggcute | HGSS | 5-6 | 20% | Rare Headbutt table; regular-tree selection depends on Trainer ID and tree group. | ||
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 |
|---|---|---|---|---|
 Bug Catcher WadeSource trainer ID 4 | Route 31 • source tile (540, 279) | ₽32 | Single battle. |
Items And Hidden Items
| Item | Method | Plain-English placement | Source tile |
|---|---|---|---|
| Potion | Visible item ball | Pick up the item ball in the northeast part of Route 31. | 557, 269 |
| Poké Ball | Visible item ball | Pick up the item ball in the south part of Route 31. | 545, 281 |
| Potion | Visible item ball | Pick up the item ball in the northwest part of Dark Cave Route 31 Side. | 10, 13 |
| Hyper Potion | Visible item ball | Pick up the item ball in the northeast part of Dark Cave Route 31 Side. | 51, 15 |
| Full Heal | Visible item ball | Pick up the item ball in the southeast part of Dark Cave Route 31 Side. | 56, 43 |
| Dire Hit | Visible item ball | Pick up the item ball in the southeast part of Dark Cave Route 31 Side. | 46, 51 |
| Black Flute | Visible item ball | Pick up the item ball in the west part of Dark Cave Route 31 Side. | 17, 25 |
| Poké Ball | Hidden / Dowsing MCHN | Use the Dowsing MCHN on the ground in the northwest part of Dark Cave Route 31 Side, 2 tiles east and 2 tiles north from the nearest source NPC. | 12, 11 |
| Max Ether | Hidden / Dowsing MCHN | Use the Dowsing MCHN on the ground in the east part of Dark Cave Route 31 Side, 8 tiles east and 11 tiles south from the nearest source NPC. | 59, 26 |
| Black Apricorn | Daily Apricorn tree | Harvest the source-indexed tree in Route 31; it regrows after the daily reset. | 538, 271 |
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 2 mapped source subareas assigned here.
- Account for 61 random, Headbutt, Safari, Contest, static, gift, trade, or event rows across the per-area tables.
- Defeat or deliberately defer all 1 listed trainer records.
- Collect 7 visible items, 2 hidden items, and 1 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.