Re: 4th Gen. Rayquaza & Kyogre Movesets
For Kyogre, unless you're experimenting with it (which you shouldn't be), if it ain't broke, don't fix it:
EVs: 252 Sp. Atk, 252 Speed, 4 HP
Rayquaza is very powerful, and can go down the physical or special route. I won't give you a moveset because there's too many, just go physical or special, not a mix.