Mega Altaria team (king DDD)

Mantine (M) @ Leftovers
Ability: Water Absorb
EVs: 240 HP / 196 Def / 72 SpD
Calm Nature
- Roost
- Scald
- Toxic
- Defog

Altaria-Mega (M) @ Altarianite
Ability: Cloud Nine
Shiny: Yes
EVs: 252 HP / 136 Def / 92 SpD / 28 Spe
Impish Nature
- Dragon Dance
- Roost
- Return
- Heal Bell

Magnezone @ Assault Vest
Ability: Magnet Pull
Shiny: Yes
EVs: 140 HP / 192 SpA / 176 Spe
Modest Nature
- Volt Switch
- Hidden Power Fire
- Thunderbolt
- Flash Cannon

Volcarona (M) @ Psychium Z
Ability: Flame Body
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Quiver Dance
- Fire Blast
- Giga Drain
- Psychic

Diggersby (M) @ Choice Scarf
Ability: Huge Power
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Return
- Earthquake
- U-turn
- Fire Punch

Tangrowth (F) @ Rocky Helmet
Ability: Regenerator
EVs: 248 HP / 212 Def / 48 SpD
IVs: 30 Atk / 30 Def
Relaxed Nature
- Giga Drain
- Knock Off
- Sleep Powder
- Hidden Power Ice