Skill?

Azelf @ Focus Sash
Ability: Levitate
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
- Explosion
- Stealth Rock
- Taunt
- Skill Swap

Talonflame @ Choice Band
Ability: Gale Wings
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Brave Bird
- Flare Blitz
- U-turn
- Will-O-Wisp

Serperior @ Leftovers
Ability: Contrary
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk / 30 SpA / 30 Spe
- Leaf Storm
- Dragon Pulse
- Hidden Power [Fire]
- Glare

Azumarill @ Sitrus Berry
Ability: Huge Power
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Aqua Jet
- Play Rough
- Superpower
- Belly Drum

Dragonite
Ability: Multiscale
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Outrage
- Extreme Speed
- Earthquake
- Dragon Dance

Landorus-Therian (M) @ Choice Scarf
Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Earthquake
- U-turn
- Stone Edge
- Knock Off