Simply Smashing

Kyurem-Black @ Choice Scarf
Ability: Teravolt
EVs: 252 Atk / 4 SpA / 252 Spe
Naive Nature
- Ice Beam
- Outrage
- Fusion Bolt
- Iron Head

Diancie-Mega @ Diancite
Ability: Magic Bounce
Shiny: Yes
EVs: 12 Atk / 244 SpA / 252 Spe
Hasty Nature
- Diamond Storm
- Earth Power
- Moonblast
- Protect

Shaymin @ Leftovers
Ability: Natural Cure
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Healing Wish
- Aromatherapy
- Seed Flare
- Synthesis

Magnezone @ Choice Specs
Ability: Magnet Pull
EVs: 168 HP / 252 SpA / 88 Spe
Modest Nature
- Volt Switch
- Hidden Power [Fire]
- Flash Cannon
- Thunderbolt

Barbaracle @ Focus Sash
Ability: Tough Claws
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Razor Shell
- Stealth Rock
- Shell Smash
- Stone Edge

Cloyster @ White Herb
Ability: Skill Link
EVs: 144 HP / 252 Atk / 4 SpD / 108 Spe
Adamant Nature
- Rapid Spin
- Shell Smash
- Icicle Spear
- Ice Shard