Just a heads up I got my Pokemon to around level 88 and when I did there hp dropped to 2. Later when I g to heal them it shows 2 hp, even if they have more when I go to heal them.

The problem is not Pokemon levels, but Pokemon health, which is indeed stored in one-byte values. I suppose I have to add a limit so no one gets over the problematic level. I should also make a savegame editor for the ones who encoutered problems. I'll do that this evening in the train (if I don't fell asleep).
Thanks for reporting

Yeah, but that means changing everything in my code to add those offsets, and this is easier to just add a "If" statement or two and limit leveling up

They wouldn't have the same stats because level 100 Pokemons wouldn't exist
I meant I'd block Pokemons to a level that doesn't cause problems, not that I'd block their health.
And I always code on computer, except in some rare cases. That allows me to have infinite backups (not really but you see what I mean) and to indent my code without that 16 chars large screen.