Pokemon LeafGreen Version Cheat Codes & Secrets
Complete collection of cheat codes, passwords, unlockables, and hidden secrets for Pokemon LeafGreen Version (2004).
GameShark and Action Replay Codes
Pokemon LeafGreen has no built-in cheat menu — hardware cheats require a GameShark, Action Replay, or emulator cheat engine (VisualBoyAdvance, mGBA). Always input the Master Code first; most codes will silently fail without it.
Master Code (CodeBreaker — required first):
| Code | Effect | Platform |
|---|---|---|
| 000005EC 000A | Master Code Line 1 | GameShark v3 / CodeBreaker |
| 10044EC8 0007 | Master Code Line 2 | GameShark v3 / CodeBreaker |
Money and Items:
| Code | Effect | Platform |
|---|---|---|
| 820257BC 423F | Infinite money (line 1) | CodeBreaker |
| 820257BE 000F | Infinite money (line 2) | CodeBreaker |
| 82025840 0001 | Master Ball in Bag Slot 1 | CodeBreaker |
| 82025840 0044 | Rare Candy in Bag Slot 1 | CodeBreaker |
| 82025840 0015 | Full Restore in Bag Slot 1 | CodeBreaker |
| 82025844 0063 | Set item quantity to 99 (Slot 1) | CodeBreaker |
Trainer and Battle Codes:
| Code | Effect | Platform |
|---|---|---|
| 509197D3 542975F4 | Walk Through Walls (line 1) | CodeBreaker |
| 78DA95DF 44018CB4 | Walk Through Walls (line 2) | CodeBreaker |
| 8202404C 0000 | All 8 Badges | CodeBreaker |
| A2FD4BDE 3FF00100 | Infinite PP (all moves) | CodeBreaker |
| 8202402C 03E7 | Max Experience Points in Battle | CodeBreaker |
Wild Pokemon Encounter Modifier — change the last two digits of the second line to swap what wild Pokemon appears:
| Code | Effect | Platform |
|---|---|---|
| 83007CEE 0097 | Encounter wild Mewtwo (#150) | CodeBreaker |
| 83007CEE 0096 | Encounter wild Dragonite (#149) | CodeBreaker |
| 83007CEE 0084 | Encounter wild Eevee (#133) | CodeBreaker |
The format is 83007CEE 00XX where XX is the Pokemon’s National Dex number in hex.
Legendary Pokemon Locations
These are in-game unlocks requiring no cheat device.
| Pokemon | Location | Requirement |
|---|---|---|
| Articuno | Seafoam Islands (B4F) | Surf + Strength to move boulders |
| Zapdos | Power Plant (north of Rock Tunnel) | Surf from Route 10 |
| Moltres | Mt. Ember summit (One Island) | Defeat Rocket grunts, HM Rock Smash |
| Mewtwo | Cerulean Cave (B1F) | Defeat Elite Four + Champion |
| Snorlax (x2) | Routes 12 and 16 | Poke Flute obtained from Mr. Fuji |
Cerulean Cave is inaccessible until you enter the Hall of Fame. No code or sequence opens it early — the game checks your save flag directly.
Sevii Islands Secrets and Unlockables
Completing the Sevii Islands questline unlocks National Pokedex Pokemon not available in Kanto.
| Unlock | How to Trigger |
|---|---|
| One, Two, Three Islands access | Receive Tri-Pass from Cinnabar Gym (Bill gives it after you meet him in the Pokemon Center on One Island) |
| Four through Seven Islands | Complete Network Machine quest on One Island, then receive Rainbow Pass |
| Bill’s Eevee | After restoring the Network Machine, speak to Bill on One Island — he gives you a free Eevee |
| Trainer Tower (Seven Island) | Complete main game; trainers here reset daily |
| Dotted Hole (Six Island) | Use Cut on the sealed door to enter; contains the Ruby and Sapphire quest items |
LeafGreen Exclusive Pokemon available in the wild on Sevii Islands: Slowpoke, Marowak, Weepinbell, Bellsprout, Magmar.
In-Game Unlockables and Rewards
| Unlock | Trigger | Location |
|---|---|---|
| Diploma | Catch all 151 Kanto Pokemon, show Oaks Aide | Celadon City Hotel room |
| HM Flash | Show Oak’s Aide 10 caught Pokemon | Route 2 gatehouse |
| HM Surf | Defeat Safari Zone warden’s conditions | Safari Zone secret house |
| Eevee (gift) | See Bill at Celadon City Pokemon Center | Your rival also appears here |
| Lapras | Talk to lone NPC on 5F of Silph Co. | One free Lapras, resets after E4 |
| Hitmonlee or Hitmonchan | Defeat Fighting Dojo, pick one | Saffron City |
| Fossil Pokemon | Pick Dome (Kabuto) or Helix (Omanyte) in Mt. Moon | Revived at Cinnabar Lab |
| Aerodactyl | Receive Old Amber from scientist | Pewter Museum back room, revive at Cinnabar |
| Porygon | Purchase for 9999 coins | Celadon Game Corner prize counter |
Exploits and Beneficial Glitches
Rare Candy Duplication via PC Deposit
This is the most reliable item duplication glitch in the game:
- Place the item you want to duplicate in your first party Pokemon’s held item slot.
- Walk to any PC and deposit that Pokemon into a box.
- Immediately switch to a different box (the game prompts a save; select Yes).
- The moment the “Saving…” text appears and the period animation begins, power off the GBA.
- Reload — the Pokemon appears both in the box AND back in your party, each holding the item.
Works best with Rare Candies, Master Balls, and PP Ups. The window is tight; practice on a disposable item first.
Cerulean Cave Early Access (Walk Sequence)
Without cheat codes, Cerulean Cave’s guard checks your save flag. However, on certain emulators with savestate manipulation, loading a state from just before the champion battle while standing inside the cave entrance allows exploration before the flag is set.
Infinite Safari Zone Steps
The Safari Zone ends after 500 steps. Saving and reloading inside the zone resets your step counter to 500 — you can repeat this indefinitely. Use this to obtain all Safari Zone Pokemon without the time pressure.
Experience Underflow Trick
If a Pokemon gains enough experience to level past 100 via Rare Candy spam on an emulator without bounds checking, stat screens display erratically. This is a display-only glitch and corrects itself after a battle.
Event-Only Pokemon (Mystery Gift / Nintendo Events)
These Pokemon were distributed via Nintendo events at retail locations and are unobtainable in normal gameplay without a cheat device.
| Pokemon | Ticket Item | Activation |
|---|---|---|
| Mew | Old Sea Map | Faraway Island (only Japanese event officially, fan-patched ROMs vary) |
| Deoxys | Aurora Ticket | Birth Island (L+R at title screen for Mystery Gift if not already unlocked) |
| Lugia / Ho-Oh | MysticTicket | Navel Rock |
Activating Mystery Gift without an event: Stand in front of a Pokemart, open your bag, and select any item. The text box will show standard shop text — ignore this. Instead, tell the NPC near the counter you want to “Wonder News.” This unlocks the Mystery Gift option on the main menu without a wireless event card, enabling use of cheat-device-entered ticket items.
Hidden Details and Developer Easter Eggs
- The S.S. Anne truck is accessible using Surf glitches or the Walk Through Walls code. The truck contains nothing — it is an empty static prop and the persistent “Mew is under the truck” rumor from Generation 1 carried into LeafGreen with no reward.
- Pokemon Tower’s ghost sequence — before obtaining the Silph Scope, the ghost displays
???for its species. Checking its summary crashes to a black screen on original hardware in some ROM revisions; save before entering. - Gary’s rival name defaults differ between FireRed (Blue, Ash) and LeafGreen (Gary, Torchic-icon defaults) depending on regional ROM — this changes the Hall of Fame text only.
- The Teachy TV item, received from an old man in Viridian City, contains Oak’s aide tutorials. Reviewing the “Cool Trainer” tape seven times back-to-back triggers an additional “secret” scene where the aide mentions Pokemon Contests — a tease for Pokemon Emerald content that was cut from the final Western release notes.
- In Cinnabar Island’s Pokemon Lab, one scientist NPC says “All your base are belong to us” in the Japanese localization; the Western release changed this line to a generic fossil dialogue, but it remains in the ROM string table.