mega diancie + band daunt bulky offense

Diancie-Mega @ Diancite
Ability: Magic Bounce
Shiny: Yes
EVs: 8 Atk / 248 SpA / 252 Spe
Naive Nature
- Moonblast
- Diamond Storm
- Hidden Power [Ice]
- Protect

Crawdaunt @ Choice Band
Ability: Adaptability
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Crunch
- Crabhammer
- Knock Off
- Aqua Jet

Tangrowth @ Assault Vest
Ability: Regenerator
Shiny: Yes
EVs: 252 HP / 4 Def / 252 SpD
Sassy Nature
- Giga Drain
- Knock Off
- Hidden Power [Fire]
- Earthquake

Jirachi @ Choice Scarf
Ability: Serene Grace
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Iron Head
- U-turn
- Ice Punch
- Healing Wish

Garchomp @ Rocky Helmet
Ability: Rough Skin
Shiny: Yes
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature
- Earthquake
- Dragon Tail
- Stealth Rock
- Fire Blast

Clefable @ Leftovers
Ability: Magic Guard
Shiny: Yes
EVs: 252 HP / 196 Def / 60 SpD
Relaxed Nature
IVs: 0 Atk / 15 Spe
- Calm Mind
- Moonblast
- Soft-Boiled
- Thunder Wave