Roost Zard Y + Mega Metagross [Gen 9 Champions] BSS Reg M-B

Hippowdon @ Leftovers
Ability: Sand Stream
Level: 50
EVs: 32 HP / 19 Def / 15 SpD
Impish Nature
- Stealth Rock
- Earthquake
- Yawn
- Slack Off

Primarina @ Mystic Water
Ability: Torrent
Level: 50
EVs: 26 HP / 32 SpA / 8 Spe
Modest Nature
- Moonblast
- Sparkling Aria
- Aqua Jet
- Flip Turn

Metagross-Mega @ Metagrossite
Ability: Tough Claws
Level: 50
EVs: 32 Atk / 2 SpD / 32 Spe
Jolly Nature
- Meteor Mash
- Psychic Fangs
- Ice Punch
- Earthquake

Hydreigon @ Choice Scarf
Ability: Levitate
Level: 50
Shiny: Yes
EVs: 2 HP / 32 SpA / 32 Spe
Modest Nature
- Draco Meteor
- Dark Pulse
- U-turn
- Flamethrower

Mimikyu @ Life Orb
Ability: Disguise
Level: 50
EVs: 2 HP / 32 Atk / 32 Spe
Adamant Nature
- Swords Dance
- Play Rough
- Shadow Sneak
- Shadow Claw

Charizard-Mega-Y @ Charizardite Y
Ability: Drought
Level: 50
EVs: 14 HP / 20 SpA / 32 Spe
Timid Nature
- Flamethrower
- Overheat
- Solar Beam
- Roost