Phase 10 section
Pokemon FireRed and LeafGreen Four Island and Icefall Cave Walkthrough
Four Island and Icefall Cave section for the FireRed and LeafGreen walkthrough with source-backed wild Pokemon, trainers, items, hidden items, bosses, and route notes.
Visit Four Island, use Waterfall in Icefall Cave, help Lorelei against Team Rocket, and collect cave rewards. This page is a standalone section for Phase 10: Post-Game Sevii Islands, with FireRed/LeafGreen source data for encounters, trainers, items, hidden items, and boss routing.
Source maps
Four Island, Four Island Harbor, Four Island House 1, Four Island House 2, Four Island Loreleis House, Four Island Mart, Four Island Pokemon Day Care, Four Island Icefall Cave Entrance, Four Island Icefall Cave 1F, Four Island Icefall Cave B1F, and Four Island Icefall Cave Back.
Route plan
Icefall Cave requires Waterfall and cracked-ice routing. HM07 Waterfall is inside the cave.
Route Notes
- The Day Care here is the two-Pokemon breeding Day Care unlocked after reaching Four Island.
Wild Pokemon
Each area below has its own table, split by encounter method. Standard wild rows merge every slot for a species into one line with a combined rate, and FireRed/LeafGreen exclusives are marked with FR/LG game chips; there is no time-of-day split in these remakes. Underlying slot odds: grass and cave 20/20/10/10/10/10/5/5/4/4/1/1; Surf and Rock Smash 60/30/5/4/1; Old Rod 70/30; Good Rod 60/20/20; Super Rod 40/40/15/4/1. Gift, static, trade, and prize Pokemon keep their own labeled rows.
Four Island
| Pokémon | Games | Levels | Rate | Notes |
|---|---|---|---|---|
| Surfing | ||||
 Marill | FRLG | 5-25 | 70% | — |
 Wooper | FRLG | 5-25 | 70% | — |
 Psyduck | FRLG | 5-35 | 30% | — |
 Slowpoke | FRLG | 5-35 | 30% | — |
| Fishing — Old Rod | ||||
 Magikarp | FRLG | 5 | 100% | — |
| Fishing — Good Rod | ||||
 Poliwag | FRLG | 5-15 | 60% | — |
 Goldeen | FRLG | 5-15 | 20% | — |
| Magikarp | FRLG | 5-15 | 20% | — |
| Fishing — Super Rod | ||||
| Poliwag | FRLG | 15-25 | 40% | — |
 Poliwhirl | FRLG | 20-30 | 40% | — |
 Gyarados | FRLG | 15-25 | 15% | — |
| Psyduck | FRLG | 15-35 | 5% | — |
| Slowpoke | FRLG | 15-35 | 5% | — |
Four Island Icefall Cave 1F
| Pokémon | Games | Levels | Rate | Notes |
|---|---|---|---|---|
| Grass / cave floor | ||||
 Swinub | FRLG | 23 or 25 or 27 or 29 or 31 | 50% | — |
 Golbat | FRLG | 45 or 48 | 25% | — |
 Seel | FRLG | 45 | 10% | — |
 Zubat | FRLG | 40 | 10% | — |
 Delibird | FRLG | 30 | 5% | — |
 Sneasel | FRLG | 30 | 5% | — |
Four Island Icefall Cave B1F
| Pokémon | Games | Levels | Rate | Notes |
|---|---|---|---|---|
| Grass / cave floor | ||||
| Swinub | FRLG | 23 or 25 or 27 or 29 or 31 | 50% | — |
| Golbat | FRLG | 45 or 48 | 25% | — |
| Seel | FRLG | 45 | 10% | — |
| Zubat | FRLG | 40 | 10% | — |
| Delibird | FRLG | 30 | 5% | — |
| Sneasel | FRLG | 30 | 5% | — |
Four Island Icefall Cave Back
| Pokémon | Games | Levels | Rate | Notes |
|---|---|---|---|---|
| Grass / cave floor | ||||
| Seel | FRLG | 43 or 45 or 47 | 40% | — |
| Golbat | FRLG | 45 or 48 | 25% | — |
 Dewgong | FRLG | 49 or 51 or 53 | 20% | — |
| Zubat | FRLG | 40 | 10% | — |
| Psyduck | FRLG | 41 | 5% | — |
| Slowpoke | FRLG | 41 | 5% | — |
| Surfing | ||||
 Tentacool | FRLG | 5-45 | 95% | — |
 Tentacruel | FRLG | 35-45 | 4% | — |
 Lapras | FRLG | 30-45 | 1% | — |
| Fishing — Old Rod | ||||
| Magikarp | FRLG | 5 | 100% | — |
| Fishing — Good Rod | ||||
 Horsea | FRLG | 5-15 | 80% | — |
 Krabby | FRLG | 5-15 | 80% | — |
| Magikarp | FRLG | 5-15 | 20% | — |
| Fishing — Super Rod | ||||
| Horsea | FRLG | 15-25 | 40% | — |
| Krabby | FRLG | 15-25 | 40% | — |
 Shellder | FRLG | 15-25 | 40% | — |
 Staryu | FRLG | 15-25 | 40% | — |
| Gyarados | FRLG | 15-25 | 15% | — |
 Kingler | FRLG | 25-35 | 4% | — |
 Seadra | FRLG | 25-35 | 4% | — |
| Psyduck | FRLG | 25-35 | 1% | — |
| Slowpoke | FRLG | 25-35 | 1% | — |
Four Island Icefall Cave Entrance
| Pokémon | Games | Levels | Rate | Notes |
|---|---|---|---|---|
| Grass / cave floor | ||||
| Seel | FRLG | 43 or 45 or 47 | 40% | — |
| Golbat | FRLG | 45 or 48 | 25% | — |
| Dewgong | FRLG | 49 or 51 or 53 | 20% | — |
| Zubat | FRLG | 40 | 10% | — |
| Psyduck | FRLG | 41 | 5% | — |
| Slowpoke | FRLG | 41 | 5% | — |
| Surfing | ||||
| Seel | FRLG | 5-35 | 60% | — |
| Psyduck | FRLG | 5-35 | 30% | — |
| Slowpoke | FRLG | 5-35 | 30% | — |
| Dewgong | FRLG | 35-40 | 5% | — |
| Marill | FRLG | 5-15 | 5% | — |
| Wooper | FRLG | 5-15 | 5% | — |
| Fishing — Old Rod | ||||
| Magikarp | FRLG | 5 | 100% | — |
| Fishing — Good Rod | ||||
| Poliwag | FRLG | 5-15 | 60% | — |
| Goldeen | FRLG | 5-15 | 20% | — |
| Magikarp | FRLG | 5-15 | 20% | — |
| Fishing — Super Rod | ||||
| Poliwag | FRLG | 15-25 | 40% | — |
| Poliwhirl | FRLG | 20-30 | 40% | — |
| Gyarados | FRLG | 15-25 | 15% | — |
| Psyduck | FRLG | 15-35 | 5% | — |
| Slowpoke | FRLG | 15-35 | 5% | — |
Trainers
| Trainer | Area / position | Team | Reward | Notes |
|---|---|---|---|---|
 GruntTeam Rocket | Four Island Icefall Cave Back | $1216 | One-time or scripted battle. Scripted map battle. |
Items And Hidden Items
| Item | Type | Area / direction | Coordinate | Requirement |
|---|---|---|---|---|
| Pearl | Hidden item | Four Island: Hidden in Four Island; press A on the tile around (22, 34). | 22, 34 | Use the Itemfinder or check the described tile. |
| Star Piece | Visible item ball | Four Island: Visible item ball in Four Island; check around tile (5, 6). | 5, 6 | HIDE FOUR ISLAND STAR PIECE |
| Stardust | Visible item ball | Four Island: Visible item ball in Four Island; check around tile (32, 19). | 32, 19 | HIDE FOUR ISLAND STARDUST |
| Ultra Ball | Hidden item | Four Island: Hidden in Four Island; press A on the tile around (6, 21). | 6, 21 | Use the Itemfinder or check the described tile. |
| HM07 Waterfall | Visible item ball | Four Island Icefall Cave 1F: Visible item ball in Four Island Icefall Cave 1F; check around tile (12, 16). | 12, 16 | HIDE FOUR ISLAND ICEFALL CAVE 1F HM07 |
| Ultra Ball | Visible item ball | Four Island Icefall Cave 1F: Visible item ball in Four Island Icefall Cave 1F; check around tile (11, 7). | 11, 7 | HIDE FOUR ISLAND ICEFALL CAVE 1F ULTRA BALL |
| Full Restore | Visible item ball | Four Island Icefall Cave B1F: Visible item ball in Four Island Icefall Cave B1F; check around tile (10, 14). | 10, 14 | HIDE FOUR ISLAND ICEFALL CAVE B1F FULL RESTORE |
| Nevermeltice | Visible item ball | Four Island Icefall Cave B1F: Visible item ball in Four Island Icefall Cave B1F; check around tile (21, 7). | 21, 7 | HIDE FOUR ISLAND ICEFALL CAVE B1F NEVER MELT ICE |
Boss Strategy
No major boss card is assigned to this section.
Completion Checklist
- Clear the route plan for Four Island and Icefall Cave before moving to the next section.
- Check the wild table for FireRed/LeafGreen version splits, rod methods, Surf, Rock Smash, static Pokemon, gifts, trades, and event-only rows when present.
- Defeat or intentionally skip optional trainers; use VS Seeker notes where rematches are available.
- Sweep visible and hidden item rows, including key items, HMs, TMs, berries, fossils, and scripted gifts.
- Review boss cards and heal before any Rival, Gym Leader, Rocket Admin, Elite Four, Champion, or legendary encounter listed above.
Sources
pret/pokefirered:src/data/wild_encounters.json,src/data/trainers.h,src/data/trainer_parties.h,data/maps/*/map.json,data/maps/*/scripts.inc,data/scripts/item_ball_scripts.inc, andgraphics/trainers/front_pics.- Encounter odds use the FR/LG slot rates: land 20/20/10/10/10/10/5/5/4/4/1/1, Surf and Rock Smash 60/30/5/4/1, Old Rod 70/30, Good Rod 60/20/20, and Super Rod 40/40/15/4/1.
- Generation III mechanics apply throughout: abilities, natures, held items, double battles, and post-game National Dex data are active in these remakes.