How to Shiny hunt unintended Game Corner Pokémon w/item underflow glitch (Part 2: Manip all 256 IDs)
Notes: The succeeding video to https://www.youtube.com/watch?v=XHoroL9bOa4 . This lets you add any of the 256 IDs (151 Pokémon +105 glitch Pokémon) to the Game Corner list (except maybe Glitch (0xCA)) and (4(h4? (0xED) due to their division by zero experience group) and buy them. As before, it requires the expanded inventory.
Steps:
Requirements:
d31d 2a 51 (21 D3) - Item 1 must be Thunderstone x211 (pointer to contents of text ID)
d321 f7 57 - Item 3 must be TM47 x 87 (contents of text ID)
d36b af d2 - Item 40 must be "Yellow" x210 (keep in regular inventory before this) - If it appears as a key item, save the game to turn it into a non-key item to toss its quantity (text pointer table)
Have Coin Case (45) and some coins
daf5 (pp move 2 of box pokemon 3) (species 1) 01 01 - PP move 2, 3, 4 +(0x40*(num PP Ups used on it)) of Pokémon 3 in current box controls Pokémon in the list. e.g. PP move 2 of 21 is Mew. See https://glitchcity.wiki/The_Big_HEX_List
For Pokémon IDs A9-FF, use PP underflow glitch on a Pokémon with no PP Ups, to get 3 PP Ups with 63 PP (which can be reduced further) https://glitchcity.wiki/Hyper_Beam_automatic_selection_glitch
d4af ff (num signs) - Done during the glitch (lets us access an out of bounds sign)
d53a 38 (PC stored item 1) (ID of glitch sign) - Sign 56 as Game Corner list (arbitrary list manipulation)
d584 04 04 (etc.) (PC stored item 38) (coordinates of glitch sign for d53a) - Poké Ball x4
A Pikachu with the same ID and OT as you (walking Pikachu)
The expanded inventory https://glitchcity.wiki/Expanded_inventory
The experience of current box Pokémon 4 must be 80 (terminating 0x50 byte for related buffer, making this glitch stable)
Have a Bicycle
Steps:
1. Go to the Game Corner and walk towards the left
2. Use Yellow and move right until Pikachu would be off-screen. End Yellow.
3. Walk a lot of steps up and down (but not too many)
4. Move left to put Pikachu back on screen, until it finishes walking (while it's doing the strange walk, it's corrupting bytes as FF, and will eventually touch the number of signs).
5. If it disappears, change item 37 quantity to 0 to enable the Bicycle, then go on it and back off.
6. Walk one step to put Pikachu on screen again.
7. Move the Yellow into item 40.
8. Two floor tiles below the middle dispenser, press A to bring up a glitch Game Corner list.
9. If done correctly, the Pokémon from stored Pokémon 3 move 2's PP will appear first in the list. Here it is Mew.
10. You're now free to buy as many as you can. The prices and levels of Pokémon can vary.
Part 3 will be how to enable trading glitch Pokémon Shinies from this glitch into equivalent Generation II Pokémon.