Pokedex Randomizer

Phase 4 section

Pokemon Yellow Celadon Gym Walkthrough

Celadon Gym section for the Pokemon Yellow walkthrough with wild Pokemon, trainers, items, hidden items, coordinates, and boss strategy.

By Damodar Sharma Updated June 23, 2026 Walkthrough

Earn the Rainbow Badge if you split the gym from the Hideout route. This page is a standalone section for Phase 4: Rainbow Badge, with source-backed Yellow encounter, trainer, item, hidden item, and boss data.

Source maps

Celadon Gym.

Wild rows0 Trainers8 Items1

Route plan

Fire, Flying, Bug, and Psychic moves are the cleanest way through the Grass/Poison gym.

Wild Pokemon

No wild Pokemon are sourced for this section.

Trainers

Route order Trainer Team Reward Optional / rematch note
1. Celadon Gym (4, 3)Erika trainer spriteErikaParty #1
Tangela Yellow sprite Tangela Lv. 30 Weepinbell Yellow sprite Weepinbell Lv. 32 Gloom Yellow sprite Gloom Lv. 32
$3,168One-time trainer; no rematch in Yellow.
2. Celadon Gym (2, 11)Lass trainer spriteLassParty #17
Bellsprout Yellow sprite Bellsprout Lv. 23 Weepinbell Yellow sprite Weepinbell Lv. 23
$345One-time trainer; no rematch in Yellow.
3. Celadon Gym (7, 10)Beauty trainer spriteBeautyParty #1
Oddish Yellow sprite Oddish Lv. 21 Bellsprout Yellow sprite Bellsprout Lv. 21 Oddish Yellow sprite Oddish Lv. 21 Bellsprout Yellow sprite Bellsprout Lv. 21
$1,470One-time trainer; no rematch in Yellow.
4. Celadon Gym (9, 5)Jr. Trainer F trainer spriteJr. Trainer FParty #11
Bulbasaur Yellow sprite Bulbasaur Lv. 24 Ivysaur Yellow sprite Ivysaur Lv. 24
$480One-time trainer; no rematch in Yellow.
5. Celadon Gym (1, 5)Beauty trainer spriteBeautyParty #2
Bellsprout Yellow sprite Bellsprout Lv. 24 Bellsprout Yellow sprite Bellsprout Lv. 24
$1,680One-time trainer; no rematch in Yellow.
6. Celadon Gym (6, 3)Lass trainer spriteLassParty #18
Oddish Yellow sprite Oddish Lv. 23 Gloom Yellow sprite Gloom Lv. 23
$345One-time trainer; no rematch in Yellow.
7. Celadon Gym (3, 3)Beauty trainer spriteBeautyParty #3
Exeggcute Yellow sprite Exeggcute Lv. 26
$1,820One-time trainer; no rematch in Yellow.
8. Celadon Gym (5, 3)Cooltrainer F trainer spriteCooltrainer FParty #1
Weepinbell Yellow sprite Weepinbell Lv. 24 Gloom Yellow sprite Gloom Lv. 24 Ivysaur Yellow sprite Ivysaur Lv. 24
$840One-time trainer; no rematch in Yellow.

Items And Hidden Items

Item Type Area / direction Coordinate Requirement
TM21 Mega DrainGym rewardDefeat Erika.-Defeat Erika.

Boss Strategy

Boss / branch Team Reward Danger notes Practical counters
Erika trainer spriteErikaErika
Tangela Yellow sprite Tangela Lv. 30 Weepinbell Yellow sprite Weepinbell Lv. 32 Gloom Yellow sprite Gloom Lv. 32
$3,168Victreebel and Vileplume spread sleep/status and Tangela can stall physical attackers.Fire, Flying, Bug, and Psychic attacks are best. Bring Awakenings or a clean switch if Sleep Powder lands.

Completion Checklist

  • Cut the tree to enter.
  • Beat all trainers for experience.
  • Defeat Erika.
  • 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 has no day/night encounter column; tables use Game, Method, and Condition instead.

Related articles

Pokemon Yellow Walkthrough HubPhase 4: Rainbow BadgePrevious: Rocket Hideout and Celadon GymNext: Pokemon Tower and Routes 12-15