Pokedex Randomizer

Phase 2 section

Pokemon Yellow Mt. Moon Walkthrough

Mt. Moon 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

Collect the cave items, beat Team Rocket, and choose a fossil. 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

Mt. Moon 1F, Mt. Moon B1F, and Mt. Moon B2F.

Wild rows15 Trainers11 Items10

Route plan

Explore side ladders before the B2F fossil fight. Zubat and Geodude are common; Clefairy is the rare prize.

Wild Pokemon

Area / subarea Game Method Pokemon Level Odds Condition / requirement
Mt. Moon 1FYellowTall grass / cave floor Zubat Yellow sprite Zubat 6-1174%Encounter rate 10; no time-of-day split in Yellow.
Mt. Moon 1FYellowTall grass / cave floor Geodude Yellow sprite Geodude 1020%Encounter rate 10; no time-of-day split in Yellow.
Mt. Moon 1FYellowTall grass / cave floor Sandshrew Yellow sprite Sandshrew 124.3%Encounter rate 10; no time-of-day split in Yellow.
Mt. Moon 1FYellowTall grass / cave floor Clefairy Yellow sprite Clefairy 111.2%Encounter rate 10; no time-of-day split in Yellow.
Mt. Moon B1FYellowTall grass / cave floor Zubat Yellow sprite Zubat 8-1165%Encounter rate 10; no time-of-day split in Yellow.
Mt. Moon B1FYellowTall grass / cave floor Geodude Yellow sprite Geodude 10-1120%Encounter rate 10; no time-of-day split in Yellow.
Mt. Moon B1FYellowTall grass / cave floor Paras Yellow sprite Paras 9-1110%Encounter rate 10; no time-of-day split in Yellow.
Mt. Moon B1FYellowTall grass / cave floor Clefairy Yellow sprite Clefairy 10-125.5%Encounter rate 10; no time-of-day split in Yellow.
Mt. Moon B2FYellowTall grass / cave floor Zubat Yellow sprite Zubat 10-1354%Encounter rate 10; no time-of-day split in Yellow.
Mt. Moon B2FYellowTall grass / cave floor Geodude Yellow sprite Geodude 1120%Encounter rate 10; no time-of-day split in Yellow.
Mt. Moon B2FYellowTall grass / cave floor Paras Yellow sprite Paras 1315%Encounter rate 10; no time-of-day split in Yellow.
Mt. Moon B2FYellowTall grass / cave floor Clefairy Yellow sprite Clefairy 9-1311%Encounter rate 10; no time-of-day split in Yellow.
Mt. Moon Pokemon CenterYellowPurchase gift Magikarp Yellow sprite Magikarp 5$500Buy from the salesman in the Pokemon Center outside Mt. Moon.
Mt. Moon B2FYellowFossil choice Kabuto Yellow sprite Kabuto RevivedDome FossilChoose the Dome Fossil, then revive it later on Cinnabar Island.
Mt. Moon B2FYellowFossil choice Omanyte Yellow sprite Omanyte RevivedHelix FossilChoose the Helix Fossil, then revive it later on Cinnabar Island.

Trainers

Route order Trainer Team Reward Optional / rematch note
1. Mt. Moon 1F (5, 6)Hiker trainer spriteHikerParty #1
Geodude Yellow sprite Geodude Lv. 10 Geodude Yellow sprite Geodude Lv. 10 Onix Yellow sprite Onix Lv. 10
$350One-time trainer; no rematch in Yellow.
2. Mt. Moon 1F (12, 16)Youngster trainer spriteYoungsterParty #3
Rattata Yellow sprite Rattata Lv. 10 Rattata Yellow sprite Rattata Lv. 10 Zubat Yellow sprite Zubat Lv. 10
$150One-time trainer; no rematch in Yellow.
3. Mt. Moon 1F (30, 4)Lass trainer spriteLassParty #5
Oddish Yellow sprite Oddish Lv. 11 Bellsprout Yellow sprite Bellsprout Lv. 11
$165One-time trainer; no rematch in Yellow.
4. Mt. Moon 1F (24, 31)Super Nerd trainer spriteSuper NerdParty #1
Magnemite Yellow sprite Magnemite Lv. 11 Voltorb Yellow sprite Voltorb Lv. 11
$275One-time trainer; no rematch in Yellow.
5. Mt. Moon 1F (16, 23)Lass trainer spriteLassParty #6
Clefairy Yellow sprite Clefairy Lv. 14
$210One-time trainer; no rematch in Yellow.
6. Mt. Moon 1F (7, 22)Bug Catcher trainer spriteBug CatcherParty #7
Weedle Yellow sprite Weedle Lv. 11 Kakuna Yellow sprite Kakuna Lv. 11
$110One-time trainer; no rematch in Yellow.
7. Mt. Moon 1F (30, 27)Bug Catcher trainer spriteBug CatcherParty #8
Caterpie Yellow sprite Caterpie Lv. 10 Metapod Yellow sprite Metapod Lv. 10 Caterpie Yellow sprite Caterpie Lv. 10
$100One-time trainer; no rematch in Yellow.
8. Mt. Moon B2F (12, 8)Super Nerd trainer spriteSuper NerdParty #2
Grimer Yellow sprite Grimer Lv. 12 Voltorb Yellow sprite Voltorb Lv. 12 Koffing Yellow sprite Koffing Lv. 12
$300One-time trainer; no rematch in Yellow.
9. Mt. Moon B2F (15, 22)Rocket trainer spriteRocketParty #2
Sandshrew Yellow sprite Sandshrew Lv. 11 Rattata Yellow sprite Rattata Lv. 11 Zubat Yellow sprite Zubat Lv. 11
$330One-time trainer; no rematch in Yellow.
10. Mt. Moon B2F (29, 11)Rocket trainer spriteRocketParty #3
Zubat Yellow sprite Zubat Lv. 12 Ekans Yellow sprite Ekans Lv. 12
$360One-time trainer; no rematch in Yellow.
11. Mt. Moon B2F (29, 17)Rocket trainer spriteRocketParty #1
Rattata Yellow sprite Rattata Lv. 13 Zubat Yellow sprite Zubat Lv. 13
$390One-time trainer; no rematch in Yellow.

Items And Hidden Items

Item Type Area / direction Coordinate Requirement
PotionVisible item ballVisible item ball at (2, 20) in Mt. Moon 1F.(2, 20)Reach this tile; HMs or story flags may be needed for late-game dungeons.
Moon StoneVisible item ballVisible item ball at (2, 2) in Mt. Moon 1F.(2, 2)Reach this tile; HMs or story flags may be needed for late-game dungeons.
Rare CandyVisible item ballVisible item ball at (35, 31) in Mt. Moon 1F.(35, 31)Reach this tile; HMs or story flags may be needed for late-game dungeons.
Escape RopeVisible item ballVisible item ball at (36, 23) in Mt. Moon 1F.(36, 23)Reach this tile; HMs or story flags may be needed for late-game dungeons.
PotionVisible item ballVisible item ball at (20, 33) in Mt. Moon 1F.(20, 33)Reach this tile; HMs or story flags may be needed for late-game dungeons.
TM12 Water GunVisible item ballVisible item ball at (5, 32) in Mt. Moon 1F.(5, 32)Reach this tile; HMs or story flags may be needed for late-game dungeons.
HP UpVisible item ballVisible item ball at (25, 21) in Mt. Moon B2F.(25, 21)Reach this tile; HMs or story flags may be needed for late-game dungeons.
TM01 Mega PunchVisible item ballVisible item ball at (29, 5) in Mt. Moon B2F.(29, 5)Reach this tile; HMs or story flags may be needed for late-game dungeons.
Moon StoneHidden itemHidden on the searchable tile at (18, 12) in Mt. Moon B2F.(18, 12)Press A on the hidden tile or use the Itemfinder nearby.
EtherHidden itemHidden on the searchable tile at (33, 9) in Mt. Moon B2F.(33, 9)Press A on the hidden tile or use the Itemfinder nearby.

Boss Strategy

Boss / branch Team Reward Danger notes Practical counters
Jessie and James trainer spriteJessie and JamesJessie and James - Mt. Moon B2F
Ekans Yellow sprite Ekans Lv. 14 Meowth Yellow sprite Meowth Lv. 14 Koffing Yellow sprite Koffing Lv. 14
$420Ekans, Meowth, and Koffing arrive right after the fossil route and can punish a tired team.Heal before the fossil room, use Confusion or Ground coverage where possible, and do not let Koffing poison your last healthy answer.

Completion Checklist

  • Collect the Moon Stones and TMs.
  • Defeat the Super Nerd guarding the fossils.
  • Choose Dome Fossil for Kabuto or Helix Fossil for Omanyte.
  • 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 2: Cascade BadgePrevious: Route 3Next: Route 4