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Brock Through Walls
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Major glitches of the Pokémon series

Arbitrary code execution (template, remote, cart-swap, unintended ROM code execution) | 2x2 block encounter glitches (Left-facing shore tile glitch (in-game trade shore encounter trick, old man trick, Trade link up shore encounter trick, Fight Safari Zone Pokémon trick)) | 99 item stack glitch | Bad clone glitch (????? party overloading (Type 0xD0 move glitch, ????? map corruption, | Celebi trick, Celebi Egg trick, Shiny Celebi trick, glitch move map corruption, overloaded party map corruption, Glitch Unown (Glitch Unown map corruption) Duplicate key items glitch (infinite items and item creation, expanded Balls pocket (TM/HMs outside of the TM/HM pocket, Glitch Pokédex categories)) | Berry glitch | Bug-Catching Contest data copy glitch (Japan only) | Cloning | Ditto DV manipulation | Elite Four door glitch (Japan only) | Expanded party encounter table manipulation | Glitch City (Safari Zone exit glitch, RAM manipulation) | Glitch meta-map script activation (Generation I) | Infinite Master Balls (Colosseum) | Large storage box byte shift glitch (storage box remaining HP glitch, maximum stat glitch) | Item duplication glitch | Item stack duplication glitch (Generation I expanded items pack (Glitch Rocket HQ maps, Map FE (English and non-English European Yellow), Map script pointer manipulation (arbitrary code execution, map script pointer item ball manipulation), Text pointer manipulation (arbitrary code execution, item ball manipulation, mart buffer overflow), Trainerless instant encounter glitch) | Transform held item glitch (Japan only) | Mimic glitch (Japan only) | Out of bounds Glitch City (Generation II) (Slowpoke Well out of bounds corruption (French version)) Lumiose City save glitch | Pikachu off-screen glitch (Trainer corruption glitch) | Pokémon merge glitch | Pomeg glitch (Pomeg data corruption glitch) | Roaming Pokémon encounter glitch | (Mimic) Transform Rage glitch | Select glitches (Japan only) (Closed menu: Dokokashira door glitch (international), Fossil conversion glitch (international), Second type glitch, Skip to Level 100 glitch, Trainer mutation glitch, walk through walls (international) Special menu: Lift glitch, Badge describer glitch) | Sketch glitch | SRAM glitch (Generation I) (255 Pokémon glitch, send party Pokémon to a new game) | Surf down glitch (Grass/rock Surfing glitch (Spanish/Italian only) (English)) | Time Capsule exploit | SRAM glitches (Generation II) (Mailbox glitches, Mystery Gift item corruption, Trainer House glitches) | Tweaking | Trainer escape glitch (Death-warp, Mew Trick, Ditto Trick, Experience underflow glitch) | Buffer overflow techniques (Japanese unterminated name glitch item instant encounter glitch, LOL glitch, Rival LOL glitch, Instant LOL glitch, RAM LOL glitch, oobLG, blockoobLG, Instant encounter infinite chain glitch (LGFly)), Super Glitch (Generation I) (party remaining HP glitch), Super Glitch (Generation III), Text pointer manipulation mart buffer overflow glitch, CoolTrainer♀-type move, Double distort CoolTrainer♀ corruption, Yami Shop glitch) | Walk through walls (ledge method, museum guy method, Rival's effect, Select glitch method (international), Brock Through Walls) | ZZAZZ glitch (party Pokémon box data shift glitch)

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Bulbapedia also has an article about Brock Through Walls.

Brock Through Walls (path manipulation walk through walls) is a walk through walls glitch in Pokémon Red, Green, Blue, and Yellow. It is popular in speedrunning Pokémon Red and Blue.

The "walk through walls" GameShark code has always been fun and useful to people. Contrary to popular belief, a similar effect is possible without the use of a game-altering device via a glitch. It is possible to perform the "Brock Through Walls" glitch very early in the games (except in Pokémon Yellow because the Youngster cannot be skipped in this version).

As it shouldn't be possible to talk to the Youngster from the right, the developers never programmed a path for the Youngster to follow when the player is right of the Youngster. When talking to him, the game looks for the player's coordinates but often never finds them, resulting in a softlock.

However, the player is able to write some pseudo-data in RAM representing the player's coordinates (which in this case should be $10 $24), which leads the game into using the next two bytes as a path pointer provided that the coordinates appear at an address at xxx2, xxx6, xxxA, or xxxE.

Particular paths may overwrite the 'disallowed buttons' variable, allowing the player to walk through walls, similar to what happens in the glitch walk through walls trick (museum guy method).


The player must have performed a method of the Pewter Gym skip glitch, or have otherwise skipped Pewter Gym through another means such as a wrong warp by manipulating item 36's quantity (exit destination) in the expanded items pack.

The latter is possible if an item quantity is manipulated to 255 (e.g. by using Missingno. to duplicate it by 128 first, reducing the quantity to 127 and duplicating it to 255). Two methods to do this without defeating Brock include the Cable Club escape glitch with Missingno. or after trading a Pokémon with "-" as the first move from Red/Blue to Yellow (as CoolTrainer corruption can freeze the game outside of particular places such as Diglett's Cave in Red/Blue but not Yellow). With "-" corruption, it is possible to corrupt the enemy Pokémon into a Missingno. by opening the Pokémon menu before opening and closing the Fight menu/scrolling past "-".

Japanese Pokémon Red, Green, and Pokémon Blue (Japanese)

  • Have a Rattata (or any Pokémon with the same mini-sprite) in the third party slot.
  • Have a Charmander (or any Pokémon with the same mini-sprite) in the fourth party slot.

Once this setup is done, flash the Pokémon menu at least once.

International Pokémon Red and Blue

Have a Bulbasaur meeting the following requirements :

  • It must be level 8.
  • It must be the last Pokémon in your party.
  • It must know exactly three attacks :
    • The second attack's PP must be exactly 16.
    • The third attack's PP must be exactly 36.

Once this is done, flash Bulbasaur's stat screen.

Or it is possible to do the following instead :

  • The first Pokémon's Special stat should be 16.
  • The second Pokémon should be a Pidgey with 15 HP left.
  • However, there should be no Rattata mini-sprite in the first two positions, or else the game will softlock.


Once the player stands on tile right from the Youngster and performed to correct action (listed in the corresponding Requirement sub-section):

  1. Talk to the Youngster, and close his dialog.
  2. You will walk automatically and the menu should keep popping up. Hold B when the menu is closed to walk around in any direction.

Guide music in a building sub-glitch

If the player walks into Pewter Museum with this glitch active, it is possible for the guide music to remain playing.

YouTube video by ChickasaurusGL

Video Demonstration

YouTube video by ChickasaurusGL

See also

External links