Sorry to answer over you guys and please don't accept this as BA but I can offer a bit more
Your Rayquazza
Rayquaza
Ability: Air Lock
Relaxed Nature
IVs: 0 Spe
- Dragon Ascent
- Dragon Pulse
- Extreme Speed
- Dragon Dance
Advised moveset for your rayquazza
Rayquaza @ Sitrus Berry
Ability: Air Lock
EVs: 100 HP / 252 Atk / 156 Def
Relaxed Nature
IVs: 0 Spe
- Dragon Ascent
- Dragon Claw
- Extreme Speed
- Dragon Dance
Advised strategy: use against staller not carrying will-o-wisp or weak-ish physical attacker that rayquazza can take hit's from (keep in mind delta stream) use dragon dance to power up and then sweep.
Advised partner: Whismicott carrying prankster and tailwind and sleep spore/ stun spore as support, also consider emolga carrying nuzzle could work and emolga looses all weaknesses from delta stream
Ideal Rayquazza
Ideal Ray (Rayquaza) @ Life Orb
Ability: Air Lock
Shiny: Yes
EVs: 76 HP / 220 Atk / 212 Spe
Adamant Nature
- Dragon Ascent
- Dragon Claw
- Extreme Speed
- Dragon Dance
Similar stratgy: Simply use 1 dragon dance and probably sweep from there.
Same partners
Beware:
Primal Groudon and Primal Kyogre (they overtake your ability)