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Author Topic: ギ▼アゴ (0xC2)'s arbitrary Pokédex data in Japanese Yellow  (Read 291 times)

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Princess Torchic Owl Lover ☽ ❤

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I found this on a 2ch discussion thread about Pokémon glitches
https://2ch.vet/re_nozomi_poke_1477904768_2_100

Basically somebody found one of my videos
(https://www.youtube.com/watch?v=_yBGAVUm0dk) and applied it to Japanese Yellow.

Quote

第一世代だけど、また新しい任意コード実行方法が発見されてた
でもこれ日本語版だと無理かも
http://www.youtube.com/watch?v=_yBGAVUm0dk

一応、図鑑内容の捏造までならVCピカチュウでも可能だった(コード実行ではない)
ボックスのポケモンにニックネームを付けたあと、ギ▼アゴ(C2h)を出して捕獲する

ニックネーム例
 17:ううらわざ
 18:んュゲバグ

ギ▼アゴの補足
・捕獲時に図鑑を表示するには、ギャロップを見つけていない必要がある
・5番目の種類を64で割った余りが32未満の場合、32大きい道具に変化する(コインケースははやぶさバッヂになるはず)
・戦闘開始の暗転後、コマンド入力可能になるまでやたら時間がかかる場合がある(グラフィックが原因?)

What the post is saying basically is if you catch ギ▼アゴ (0xC2) (possible with Trainer escape glitch and a Special stat of 194) and do not have Rapidash set as seen in the Pokédex, its Pokédex entry will appear. Its category will be based on the second character of Pokémon 17 in the Pokémon storage system (beginning at DEC5) and the data that follows.

This is what you get for the quoted example.



裏技   【うらわざ】 means "secret trick" but is actually a cultural phrase. In this case ギ▼アゴ is now the 'secret trick' Pokémon and has the word "バグ" (bug as in a software bug) in the main text of its Pokédex entry.

According to my research for ₽ (hex:F9) in English Yellow, the source is F403 (copy of D403) and using the 08 text command character five bytes after the category name's first 0x50 byte could execute arbitrary code.

However, I don't know if the poster was ever able to execute arbitrary code, and placing the 08 five bytes after the category name's 0x50 for ギ▼アゴ doesn't want to work for me for some reason (in fact the main entry text box text occupies this region but it ignored the text command character).

I tested this in v1.0 so there is a chance it could work differently in v1.1, v1.2 or v1.3. However the 2ch poster said it works on Virtual Console Yellow which could be v1.1+(?)
« Last Edit: April 10, 2018, 04:44:18 pm by Princess Torchic ❤ »

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Re: ギ▼アゴ (0xC2)'s arbitrary Pokédex data in Japanese Yellow
« Reply #1 on: April 11, 2018, 07:02:12 am »
This might be due to Pokédex entries being printed using a certain control char, which probably ignores all other control chars (since text is printed differently).
I might be wrong though, I haven't looked into it.
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