Phase 10 section
Pokemon FireRed and LeafGreen Cerulean Cave and Mewtwo Walkthrough
Cerulean Cave and Mewtwo section for the FireRed and LeafGreen walkthrough with source-backed wild Pokemon, trainers, items, hidden items, bosses, and route notes.
After fixing the Network Machine, enter Cerulean Cave, sweep high-level wild tables, and catch Mewtwo. 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
Cerulean Cave 1F, Cerulean Cave 2F, and Cerulean Cave B1F.
Route plan
Bring Ultra Balls/Timer Balls, status, Surf, and Escape Rope. Mewtwo is Lv. 70 on B1F.
Route Notes
- Cerulean Cave opens after the post-game Network Machine and National Dex conditions are satisfied.
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.
Cerulean Cave 1F
| Pokémon | Games | Levels | Rate | Notes |
|---|---|---|---|---|
| Grass / cave floor | ||||
 Parasect | FRLG | 49 or 58 | 25% | — |
 Magneton | FRLG | 49 | 20% | — |
 Golbat | FRLG | 46 or 55 | 14% | — |
 Ditto | FRLG | 52 or 61 | 11% | — |
 Primeape | FRLG | 52 or 61 | 11% | — |
 Machoke | FRLG | 46 | 10% | — |
 Electrode | FRLG | 58 | 5% | — |
 Wobbuffet | FRLG | 55 | 4% | — |
| Surfing | ||||
 Psyduck | FRLG | 30-50 | 65% | — |
 Slowpoke | FRLG | 30-50 | 65% | — |
 Golduck | FRLG | 40-55 | 35% | — |
 Slowbro | FRLG | 40-55 | 35% | — |
| Rock Smash | ||||
 Geodude | FRLG | 30-50 | 65% | — |
 Graveler | FRLG | 40-55 | 35% | — |
| 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% | — |
Cerulean Cave 2F
| Pokémon | Games | Levels | Rate | Notes |
|---|---|---|---|---|
| Grass / cave floor | ||||
| Golbat | FRLG | 49 or 58 | 25% | — |
| Machoke | FRLG | 49 | 20% | — |
| Parasect | FRLG | 52 or 61 | 14% | — |
| Ditto | FRLG | 55 or 64 | 11% | — |
 Kadabra | FRLG | 55 or 64 | 11% | — |
| Magneton | FRLG | 52 | 10% | — |
| Wobbuffet | FRLG | 58 | 5% | — |
| Electrode | FRLG | 61 | 4% | — |
| Rock Smash | ||||
| Geodude | FRLG | 35-55 | 65% | — |
| Graveler | FRLG | 45-60 | 35% | — |
Cerulean Cave B1F
| Pokémon | Games | Levels | Rate | Notes |
|---|---|---|---|---|
| Grass / cave floor | ||||
| Ditto | FRLG | 58 or 67 | 25% | — |
| Kadabra | FRLG | 58 or 67 | 25% | — |
| Parasect | FRLG | 55 or 64 | 14% | — |
| Golbat | FRLG | 52 or 61 | 11% | — |
| Machoke | FRLG | 52 | 10% | — |
| Magneton | FRLG | 55 | 10% | — |
| Electrode | FRLG | 64 | 4% | — |
| Wobbuffet | FRLG | 61 | 1% | — |
| Surfing | ||||
| Psyduck | FRLG | 40-60 | 65% | — |
| Slowpoke | FRLG | 40-60 | 65% | — |
| Golduck | FRLG | 50-65 | 35% | — |
| Slowbro | FRLG | 50-65 | 35% | — |
| Rock Smash | ||||
| Geodude | FRLG | 40-60 | 65% | — |
| Graveler | FRLG | 50-65 | 35% | — |
| 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 | 15-35 | 16% | — |
| Psyduck | FRLG | 15-25 | 4% | — |
| Slowpoke | FRLG | 15-25 | 4% | — |
| Static encounter | ||||
 Mewtwo | FRLG | 70 | Static | One-time scripted encounter in Cerulean Cave B1F. |
Trainers
No regular trainers are sourced for this section.
Items And Hidden Items
| Item | Type | Area / direction | Coordinate | Requirement |
|---|---|---|---|---|
| Full Restore | Visible item ball | Cerulean Cave 1F: Visible item ball in Cerulean Cave 1F; check around tile (11, 16). | 11, 16 | HIDE CERULEAN CAVE 1F FULL RESTORE |
| Max Elixir | Visible item ball | Cerulean Cave 1F: Visible item ball in Cerulean Cave 1F; check around tile (25, 5). | 25, 5 | HIDE CERULEAN CAVE 1F MAX ELIXIR |
| Nugget | Visible item ball | Cerulean Cave 1F: Visible item ball in Cerulean Cave 1F; check around tile (7, 3). | 7, 3 | HIDE CERULEAN CAVE 1F NUGGET |
| Ultra Ball | Hidden item | Cerulean Cave 1F: Hidden in Cerulean Cave 1F; press A on the tile around (12, 2). | 12, 2 | Use the Itemfinder or check the described tile. |
| Full Restore | Visible item ball | Cerulean Cave 2F: Visible item ball in Cerulean Cave 2F; check around tile (33, 12). | 33, 12 | HIDE CERULEAN CAVE 2F FULL RESTORE |
| PP Up | Visible item ball | Cerulean Cave 2F: Visible item ball in Cerulean Cave 2F; check around tile (9, 18). | 9, 18 | HIDE CERULEAN CAVE 2F PP UP |
| Ultra Ball | Visible item ball | Cerulean Cave 2F: Visible item ball in Cerulean Cave 2F; check around tile (29, 16). | 29, 16 | HIDE CERULEAN CAVE 2F ULTRA BALL |
| Max Revive | Visible item ball | Cerulean Cave B1F: Visible item ball in Cerulean Cave B1F; check around tile (32, 2). | 32, 2 | HIDE CERULEAN CAVE B1F MAX REVIVE |
| Ultra Ball | Visible item ball | Cerulean Cave B1F: Visible item ball in Cerulean Cave B1F; check around tile (31, 9). | 31, 9 | HIDE CERULEAN CAVE B1F ULTRA BALL |
Boss Strategy
No major boss card is assigned to this section.
Completion Checklist
- Clear the route plan for Cerulean Cave and Mewtwo 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.