If it's the graphics, look at the stats of a non-glitched Pokemon. That should fix it up.Once I did an experiment by catching MISSINGNO and see what it would do to my game. It got messed up. Good thing I didn't save.
If it's in FireRed, then it's NOT A F**KING MISSINGNO.!!! Look at it's name fisrst before you go "oh, that's a weird glitchy Pokemon, so it must be a Missingno." Not all glitch Pokemon are Missingno. >_>one time i caught a missing no. and saved odd enough nothing happened.then i traded it to pokemon fire red save nothing happened then i traded it to diamond and pearl and it messed up my game.all pokemon even trainers had missing no. i swear.
No... You can only get it with these steps:I heard about a glitch called Charizard 'm. you can get it by doing the mew glitch with a level 136 pokemon. it will turn all your party pokemon into charizard m'. (thanks to either bulbapedia or wikimedia for this! ^-^)
Actually my favorite glitch has to be the Mew one where you spare the slowpoke trainer for awhile then like fly to lavender town or somethin like that.
it actually took me awhile cause i dident fly away from the gambler quick enough.