Phase 10 section
Pokemon Yellow Cerulean Cave Completion Walkthrough
Cerulean Cave Completion section for the Pokemon Yellow walkthrough with wild Pokemon, trainers, items, hidden items, coordinates, and boss strategy.
Enter Cerulean Cave after becoming Champion, collect its rare encounters and items, and catch Mewtwo. This page is a standalone section for Phase 10: Post-Game + Completion, with source-backed Yellow encounter, trainer, item, hidden item, and boss data.
Source maps
Cerulean Cave 1F, Cerulean Cave 2F, and Cerulean Cave B1F.
Wild rows38 Trainers0 Items15
Route plan
Cerulean Cave has the highest wild levels in Yellow. Bring Surf, strong balls, status, and an escape plan.
Wild Pokemon
Each area below has its own table, split into encounter method bands: tall grass / cave floor, Surfing, the three rods, then gift, trade, prize, and static rows. Grass and Surf rows merge every Gen I wild slot for a species and show the combined odds out of 256 (slot rates 51/256, 51/256, 39/256, 25/256, 25/256, 25/256, 13/256, 13/256, 11/256, and 3/256). Generation I has no time-of-day split, so no rate varies with the clock; a — note means the row needs nothing beyond reaching the area.
Cerulean Cave 1F
| Pokémon | Levels | Rate | Notes |
|---|---|---|---|
| Tall grass / cave floor | |||
 Golbat | 50-55 | 40% | — |
 Graveler | 45 | 15% | — |
 Gloom | 55 | 9.8% | — |
 Weepinbell | 55 | 9.8% | — |
 Sandslash | 52 | 9.8% | — |
 Ditto | 55-60 | 5.5% | — |
 Venomoth | 54 | 5.1% | — |
 Parasect | 54 | 5.1% | — |
| Fishing — Old Rod | |||
 Magikarp | 5 | 100% | Any fishable water tile. |
| Fishing — Good Rod | |||
 Goldeen | 10 | 50% | Any fishable water tile after getting Good Rod. |
 Poliwag | 10 | 50% | Any fishable water tile after getting Good Rod. |
| Fishing — Super Rod | |||
| Goldeen | 25 | 25% | Yellow Super Rod slot table. |
 Seaking | 35 | 25% | Yellow Super Rod slot table. |
| Seaking | 45 | 25% | Yellow Super Rod slot table. |
| Seaking | 55 | 25% | Yellow Super Rod slot table. |
Cerulean Cave 2F
| Pokémon | Levels | Rate | Notes |
|---|---|---|---|
| Tall grass / cave floor | |||
| Golbat | 52-57 | 40% | — |
| Graveler | 50 | 15% | — |
| Sandslash | 56 | 9.8% | — |
 Rhyhorn | 50 | 9.8% | — |
| Ditto | 60 | 9.8% | — |
 Rhydon | 58-60 | 5.5% | — |
| Gloom | 58 | 5.1% | — |
| Weepinbell | 58 | 5.1% | — |
Cerulean Cave B1F
| Pokémon | Levels | Rate | Notes |
|---|---|---|---|
| Tall grass / cave floor | |||
| Golbat | 54-59 | 40% | — |
| Graveler | 55 | 15% | — |
| Ditto | 60-65 | 15% | — |
| Rhyhorn | 52 | 9.8% | — |
| Rhydon | 62 | 9.8% | — |
 Lickitung | 50-55 | 5.5% | — |
 Chansey | 56 | 5.1% | — |
| Fishing — Old Rod | |||
| Magikarp | 5 | 100% | Any fishable water tile. |
| Fishing — Good Rod | |||
| Goldeen | 10 | 50% | Any fishable water tile after getting Good Rod. |
| Poliwag | 10 | 50% | Any fishable water tile after getting Good Rod. |
| Fishing — Super Rod | |||
| Goldeen | 30 | 25% | Yellow Super Rod slot table. |
| Seaking | 40 | 25% | Yellow Super Rod slot table. |
| Seaking | 50 | 25% | Yellow Super Rod slot table. |
| Seaking | 60 | 25% | Yellow Super Rod slot table. |
| Static Pokemon | |||
 Mewtwo | 70 | Static | Interact with the overworld Pokemon. |
Trainers
No regular trainers are sourced for this section.
Items And Hidden Items
| Item | Type | Area / direction | Coordinate | Requirement |
|---|---|---|---|---|
| Rare Candy | Visible item ball | Visible item ball at (29, 16) in Cerulean Cave 1F. | (29, 16) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| Max Elixer | Visible item ball | Visible item ball at (7, 11) in Cerulean Cave 1F. | (7, 11) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| Max Revive | Visible item ball | Visible item ball at (29, 9) in Cerulean Cave 1F. | (29, 9) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| Ultra Ball | Visible item ball | Visible item ball at (18, 3) in Cerulean Cave 1F. | (18, 3) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| Rare Candy | Visible item ball | Visible item ball at (0, 11) in Cerulean Cave 2F. | (0, 11) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| Ultra Ball | Visible item ball | Visible item ball at (16, 7) in Cerulean Cave 2F. | (16, 7) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| Max Revive | Visible item ball | Visible item ball at (19, 11) in Cerulean Cave 2F. | (19, 11) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| Full Restore | Visible item ball | Visible item ball at (27, 9) in Cerulean Cave 2F. | (27, 9) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| Ultra Ball | Visible item ball | Visible item ball at (26, 1) in Cerulean Cave B1F. | (26, 1) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| Ultra Ball | Visible item ball | Visible item ball at (2, 13) in Cerulean Cave B1F. | (2, 13) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| Max Revive | Visible item ball | Visible item ball at (3, 13) in Cerulean Cave B1F. | (3, 13) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| Max Elixer | Visible item ball | Visible item ball at (15, 3) in Cerulean Cave B1F. | (15, 3) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| PP Up | Hidden item | Hidden on the searchable tile at (18, 7) in Cerulean Cave 1F. | (18, 7) | Press A on the hidden tile or use the Itemfinder nearby. |
| PP Up | Hidden item | Hidden on the searchable tile at (16, 13) in Cerulean Cave 2F. | (16, 13) | Press A on the hidden tile or use the Itemfinder nearby. |
| PP Up | Hidden item | Hidden on the searchable tile at (8, 14) in Cerulean Cave B1F. | (8, 14) | Press A on the hidden tile or use the Itemfinder nearby. |
Boss Strategy
| Boss / branch | Team | Reward | Danger notes | Practical counters |
|---|---|---|---|---|
 Champion RivalMewtwo capture prep | Static encounter | Mewtwo is level 70 with huge Special and Speed. | Bring Ultra Balls, status, a sleep/paralysis user, and a Pokemon that can take Psychic without fainting instantly. |
Completion Checklist
- Collect every Cerulean Cave item.
- Catch rare high-level wild Pokemon.
- Capture Mewtwo.
- Verify the Yellow encounter rows before leaving if you are filling the Pokedex.
- Use the item rows as a visible-item and hidden-item sweep before moving to the next section.
Sources
pret/pokeyellow: wild encounters, trainer parties, trainer money, map object events, hidden event items, rods, trades, and prize Pokemon.- Encounter odds aggregate the Gen I ten-slot rates: 51/256, 51/256, 39/256, 25/256, 25/256, 25/256, 13/256, 13/256, 11/256, and 3/256.
- Yellow is a single-game guide with no day/night encounter split; each area table groups species under method bands with Levels, Rate, and Notes columns.