Pokemon Battle Intro Sprite Offset - Deijin27/RanseiLink GitHub Wiki
Examples of Battle Intro Offsets which pokemon have which values: https://pastebin.com/kt1jCzzJ
0 (unused)
1 (e.g. mismagius)
2 (e.g. eevee)
3 (unused, slightly to the right of 2)
4 (e.g. reshiram)
5 (causes the game to freeze)
6 (the pokemon isn’t visible)
7 (weirdly back towards the middle again, between 0 and 1)