HO Mega Gyara

Gyarados @ Gyaradosite
Ability: Intimidate
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Dragon Dance
- Waterfall
- Crunch
- Earthquake

Talonflame (F) @ Sharp Beak
Ability: Gale Wings
EVs: 80 HP / 252 Atk / 178 Spe
Jolly Nature
- Brave Bird
- Flare Blitz
- Roost
- Swords Dance

Serperior (F) @ Life Orb
Ability: Contrary
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Leaf Storm
- Hidden Power [Fire]
- Dragon Pulse
- Giga Drain

Latios (M) @ Life Orb
Ability: Levitate
EVs: 24 Atk / 232 SpA / 252 Spe
Naive Nature
- Draco Meteor
- Psyshock
- Earthquake
- Defog

Heatran @ Choice Scarf
Ability: Flash Fire
EVs: 4 Atk / 252 SpA / 252 Spe
Hasty Nature
- Fire Blast
- Flash Cannon
- Earth Power
- Stone Edge

Landorus-Therian (M) @ Leftovers
Ability: Intimidate
EVs: 248 HP / 252 Def / 8 Spe
Impish Nature
- Stealth Rock
- Stone Edge
- Earthquake
- U-turn