They both have their own ways
Rayquaza @Sitrus Berry (Fast psychical Sweeper)
Adamant EV: 252 Atk / 252 Hp or speed / 4 Hp or speed
Dragon Dance.................... Swords Dance
Dragon Ascent.........Or.... Dragon Ascent (e speed killer
Dragon Claw ..................... Extreme Speed
Earthquake ......................... Earthquake
So for set 1 set up a few dragon dances and sweep and for 2 use 2 - 3 swords dance and extreme speed sweep
Kyogre @ Blue Orb / Leftovers (Bulky Special Sweeper)
Modest EVs: 252 SpA, 252 Spe, 4 HP or 252 SpA, 252 HP, 4 Def
Origin Pulse / Surf (If using x and y)
Water Spout / Hidden power Ground (To Beat Groudon) / Rest
Thunder / Sleep Talk
Calm mind
So for this set set some calm mind up (primal kyogre with 2 calm minds with full sp.atk at lv 100 takes its sp atk over 1000 I think) and sweep. rest if you have low hp.
So if you need a fast sweeper then take rayquaza and if you need some bulk then kyogres the way to go.
ps : This is my first answer so if its bad then sorry :( and if its good then yay :)