Rayquaza @ Wise Glasses
Ability: Air Lock
EVs: 252 SpA / 4 SpD / 252 Spe
Modest Nature
- Draco Meteor / Dragon Pulse
- Air Slash
- Focus Blast
- Earth Power
Draco Meteor / Dragon Pulse - STAB, covers Dragon weakness
Air Slash - STAB, coverage decent power and a good chance of causing the foe to flinch.
Focus Blast - Covers 2 weaknesses, and crazy power and a chance to lower the foe's Special Defense.
Earth Power - Large range of coverage, chance to decrease foe's Special Defense.
Rayquaza is an absolute beauty, this set is about coverage and decreasing the foes Special Defense, which is either useful and/or needed dependent on if you choose Draco Meteor or Dragon Pulse, you're gonna have to choose between the two but either is fine.
Rayquaza @ Persim Berry / Choice Scarf
Ability: Air Lock
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Outrage / Dragon Claw
- Stone Edge
- Earthquake
- Swords Dance / Dragon Dance
Outrage / Dragon Claw - STAB, crazy power, covers Dragon weakness
Stone Edge - great power, high critical hit ratio, coverage.
Earthquake - great power, accuracy, coverage.
Swords Dance / Dragon Dance - sharply raises Atk, or raises Atk and Spe
This set is also pretty good, covers all weaknesses and allows for a boost in Atk and/or Spd, really a power set. If you choose Outrage, then pick the Persim Berry as your item, otherwise Choice Scarf to make for a dangerous sweeper.
Rayquaza @ King's Rock
Ability: Air Lock
EVs: 128 Atk / 128 SpA / 252 Spe
Jolly Nature
- Draco Meteor
- Iron Tail / Iron Head
- Earthquake
- Air Slash
Draco Meteor - STAB, covers dragon weakness.
Iron Tail / Iron Head - coverage of weaknesses (including Fairy).
Earthquake - it's Earthquake dude...
Air Slash - STAB, decent power and decent chance to flinch the foe.
This set is aimed for Rayquaza to be fast as heck and flinch the foe and just kill anything it crosses, because a Dragon type move is hardly called for, Draco Meteor works in this set for a powerful fast strike, plus the decrease in the Sp.atk doesn't affect the rest of the set. Air Slash is there just to flinch the opponent, and to handle Pokemon with the ability Sturdy. This set is just there for competitive purposes, it's is an annoying set to face that does crazy damage and covers a lot of types.