Oh I forgot about Rough Skin... But 252 Atk 252 SpA Naughty Dragonite does 38.7-45.9% to Hippowdon with Waterfall, 252 Atk 252 SpA Rash Dragonite does 69.5-82.4% with Surf or Ice Beam. So there is a chance that you could lose with +Atk 252 Atk Waterfall. Edit: Sorry Jumpman I always forget to factor in the level of the opponent. Is there some chart that shows at what levels you find Pokémon in the Battle Hall? And Chinese Dood, the last part of that paragraph was regarding Hippowdon, but somehow forgot to mention that.