Originally Posted by Fat Arcticblast
Kyogre isn't weak to Dragon. With Dragon Tail and Contrary Draco Meteor everywhere, that's important.
On that note, Hydro Pump over Water Spout. You'd be surprised how quickly Kyogre accumulates damage.
EDIT @Skyshade: Timid nature, Giga Drain over Rest, and some other ability over Early Bird. You're currently completely walled by Dark types, so having Giga Drain is useful (the only Dark types that resist Giga Drain have stats too low to use effectively). Pokemon like Dialga and Registeel still eat you though.
1) you shouldn't be switching into Contrary Draco Meteor or Dragon Tail anyway, as Kyogre still doesn't like all the damage it'll be taking
2) the extra damage from STAB Draco Meteor / Spacial Rend can take out things non-STAB Spacial Rend cannot
I agree with Hydro Pump over Water Spout. Extremespeed will quickly deplete your health and make Water Spout very weak.