Phase 2 section
Pokemon Yellow Route 4 Walkthrough
Route 4 section for the Pokemon Yellow walkthrough with wild Pokemon, trainers, items, hidden items, coordinates, and boss strategy.
Exit Mt. Moon, collect the outside Route 4 items, and drop into Cerulean. This page is a standalone section for Phase 2: Cascade Badge, with source-backed Yellow encounter, trainer, item, hidden item, and boss data.
Source maps
Route 4.
Route plan
The ledge makes this one-way until later. Finish Mt. Moon before jumping down.
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.
| Pokémon | Levels | Rate | Notes |
|---|---|---|---|
| Tall grass / cave floor | |||
 Spearow | 8-12 | 55% | — |
 Mankey | 9 | 15% | — |
 Sandshrew | 8-10 | 15% | — |
 Rattata | 10-12 | 15% | — |
| 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 | 20 | 25% | Yellow Super Rod slot table. |
| Goldeen | 25 | 25% | Yellow Super Rod slot table. |
| Goldeen | 30 | 25% | Yellow Super Rod slot table. |
 Seaking | 30 | 25% | Yellow Super Rod slot table. |
Trainers
| Route order | Trainer | Team | Reward | Optional / rematch note |
|---|---|---|---|---|
| 1. Route 4 (63, 3) |  LassParty #4 | $465 | One-time trainer; no rematch in Yellow. |
Items And Hidden Items
| Item | Type | Area / direction | Coordinate | Requirement |
|---|---|---|---|---|
| TM04 Whirlwind | Visible item ball | Visible item ball at (57, 3) in Route 4. | (57, 3) | Reach this tile; HMs or story flags may be needed for late-game dungeons. |
| Great Ball | Hidden item | Hidden on the searchable tile at (40, 3) in Route 4. | (40, 3) | Press A on the hidden tile or use the Itemfinder nearby. |
Boss Strategy
No boss or Rival branch is attached to this section.
Completion Checklist
- Pick up Route 4's visible TM and hidden Great Ball.
- Check the Yellow Route 4 encounter rows before dropping into Cerulean.
- Enter Cerulean stocked for Rival and Misty.
- 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.