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Brock through walls: Difference between revisions
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This setup will write "10 24 00 0F" to $D196 – $D199.
====International Yellow====
As above, a copy of the player's coordinates before talking to the guide needs to appear at xxx2, xxx6, xxxA, or xxxE to 'align'. However, for [[Pokémon Yellow#RAM layout|the reasons here]], all variables in WRAM after $CF1A are shifted up a byte (so as an example, the address of the third item in the bag is $D322 in Red/Blue, but $D321 in Yellow).
The 00 0F path however does not result in walk through walls in English Yellow, so another path must be used, such as the 01 06 or 01 39 path. As in the [[Pokémon Yellow reverse badge acquisition no underflow route]], this works from an odd item slot with [item] x (y-coordinate; typically x16) | HP Up x (x-coordinate; typically x36) | <Max Repel/Bicycle>. For [[Brock through walls#Brock through walls from a wall|Brock through walls from a wall]], the y-coordinate is represented by x15 and the x-coordinate by x35 instead.
====Japanese {{RGB}}====
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==Explanation==
As mentioned above, the glitch works by tricking the game into loading an invalid path (path pointer) for the player to follow. If the coordinates and pointer pair for the path is not found at xxx2,
The game never seems to intentionally set $CD3B to any nonzero value, but its effect is to allow certain joypad inputs to override scripted movement. 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.
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This variant is named "Brock Fly" because "Trainer Fly" is a more commonly known name for the trainer escape glitch, but of course other escape methods (Teleport, Dig/Escape Rope, death-warp) can also be used.
The bytes in the path pointer that replace $CD2D and $CD2E correspond with (path pointer)+52 (0x34) and (path pointer)+53 (0x35). For example, for the custom path E7DA (DAE7) in Yellow (assuming it has no 0xFF until after $DB36), a 0x15 at $DB1B (PC Pokémon 5 HP (modulo 256)), and 0x14 at $DB1C (PC Pokémon 5 level) would result in 0x15 at $CD2D and 0x14 at $CD2E. Hence, the Pokémon encountered would be a Level 20 Mew. (In Red/Blue the equivalent path would be E8DA).
{{YouTube|9lMDWy2d6ys|krazyd4n}}
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It is possible to trigger this glitch from the ''top'' of the Youngster, as long as the player can reach there using another glitch (e.g. [[Rival's effect]]). The principle of setup is similar, but instead of "0x10 0x24", the player needs to set up "0x0F 0x23" at an appropriate address, since that is the coordinates of the tile above the Youngster.
Notably, this variant is used in the
===Obtaining both fossils===
After setting up Brock through walls, the player can hold down B and walk through walls to enter Mt. Moon from the Route 4 side. Although the ability to walk through walls is disabled, the player is still able to walk around if the player picks up the Helix Fossil first (right-side from above). Afterwards, the player can pick up the Dome Fossil as well with a down, left, A input.
This does not work for attempting to pick up the Dome Fossil first (left-side from above), nor the Helix Fossil first and a left, down, A input because both of these actions activate the Super Nerd's script.
{{YouTube|ONfXcIFBfO8|Cheese N Things}}
For a Pokémon Yellow variation of Brock through walls, it works the same way (even after battling Jessie & James after glitching into the cave).
=== Surf on land ===
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