I have found the most annoying glitch when battling julia (still can't beat her, I really should have thought twice about choosing froakie...). Whenever she uses a move, such as mud-slap or charge beam, the stats go up twice, but only the first time it is used on a single pokemon. For example, when her helioptile uses mud-slap on my litleo (love that pokemon btw), its accurancy is lowered twice instead of once, although I do like it because it makes her extra hard, it can be annoying when her electrode gets 2 special attack boosts and proceeds to sweep my team, which is ironic because electrode isn't a very good pokemon. Not bad, but not like luxray or anything. And its ONLY her pokemon, every other one doesn't get that double glitch.