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Brock through walls: Difference between revisions
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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 {{Y}} because the Youngster cannot be skipped in this version).
There are many ways to set up this glitch, but the glitch is ultimately triggered by talking to the Pewter City Youngster from the right.
However, the player can manipulate some values in the RAM to spell out the player's coordinates, (0x10, 0x24). The coordinates need to appear at address xxx2, xxx6, xxxA, or xxxE to "align" with the lookup table. When this happens, the game will use the next two bytes as a path pointer.
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]].▼
==Setup==
===Getting past the Youngster===
The easiest way to be able to talk to the Youngster from the right is to perform a method of the [[Pewter Gym skip glitch]]. After performing the glitch, simply walk right to Route 3, then go back to the Pewter City map to reload the Youngster.
▲The player
===Japanese {{RGB}}===▼
* Using the [[Cable Club escape glitch]] to encounter a [[Missingno.]]
* Have a Rattata (or any Pokémon with the same mini-sprite) in the third party slot.▼
* Trading a Pokémon with [[- (move)|"-" as the first move]] from Red/Blue to Yellow, and use "-" corruption to corrupt the enemy Pokémon into a Missingno.
* Have a Charmander (or any Pokémon with the same mini-sprite) in the fourth party slot.▼
After using Missingno. item duplication to manipulate an item quantity to 255, [[dry underflow]] can be performed.
Once this setup is done, flash the Pokémon menu at least once.▼
A third possibility is to first defeat Brock, and later use another glitch to corrupt the "defeated Brock" event flag back to 0.
===International {{RB}}===▼
Have a Bulbasaur meeting the following requirements :▼
===Setting up "0x10 0x24" in RAM===
There are multiple methods to set up "0x10 0x24" in a suitable location in RAM. Some common setups are describes below.
▲====International {{RB}}====
* It must be level 8.
* It must be the '''last''' Pokémon in your party.
* It must know exactly three
** The second
** The third
Once this is done, viewing the Pokémon party screen (also known as "flashing" the Pokémon party) will copy the data "10 24 00 08" to $CFB6 ~ $CFB9. (Notice that the path pointer is small endian, so this will use $0800 as the path pointer.)
A popular choice for this Pokémon is the starter Bulbasaur, which starts with Tackle (35 PP) and Growl (40 PP), and learns Leech Seed at level 7 (as the first move).
{{researchneeded|Why the "no Rattata mini-sprite" requirement?}}
{{clr}}
Another setup may be faster, especially if the starter happen to have the required 16 Special:
* 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.
This setup will put "10 24 00 0F" at $D196 ~ $D199.
▲====Japanese {{RGB}}====
▲* 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.
==Procedure==
Once the player stands on the tile right from the Youngster and
# Talk to the Youngster, and close his dialog.
# You will walk automatically and the menu should keep popping up. Hold B when the menu is closed to walk around in any direction.
==Explanation==
As mentioned above, the glitch works by tricking the game into loading an invalid path for the player to follow, which overwrites $CD38.
The game never seem to intentionally set $CD38 to any nonzero value, but its effect is to allow certain joypad inputs to override scripted movement. And it is very generous: As long as the player is holding down any of the specified buttons, the entire joypad input is accepted. For example, if the B button is able to override, then the player can simple hold down the B button to be able to walk in any direction or to stay put.
Of course, the point of this whole setup is that the player will be able to walk through walls and NPCs, just like in any scripted movement (except for the [[Get stuck in a wall|last]] [[Walk on water through Surf|step]]).
==Guide music in a building sub-glitch==
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