look out for his Crobat. My Deoxys used Psychic (Hasty, 31 IV's, 252 EV's Sp. Atk) and it did just over half health to his crobat. I ran the damage calcs and even with 252 HP, it should still have been at least 93% damage. Also, before the DC, my Mamoswine used Ice Shard and just got into the yellow (by a sliver) and running the calcs it should have done at least 80% damage. O_O
~T_S