this meta was not prepared for lcotm. you can force a crash before turn 1, and you can't forfeit from in the battle. leppa berry harvest stall isn't banned. you can have stats underflow, because stat boosts and drops stack on switchin instead of the beginning of the game, so accelgor magikarp is a special wall. but also they never overflow. this means, presumably, the underflow goes not to calculating base 255, but to the maximum the simulator can handle. this meta was not prepared for any time on the main server, at all. i was excited for this meta, and there is no way in hell that i'm going to be playing it unless these are fixed immediately. i am disappointed in the coders and the people who chose this meta with (evidently) almost zero playtesting.
MaximeLopunny mentioned that the same glitch happens on DragonHeaven, perhaps there are differences in the code between ROM and DragonHeaven/main and that's why this is happening? It's very possible that I'm wrong though, I don't know where to look for the code or what to look for in it