New core idea?

Slowbro-Mega @ Slowbronite
Ability: Shell Armor
EVs: 248 HP / 232 Def / 28 SpD
Bold Nature
IVs: 0 Atk
- Slack Off
- Scald
- Psyshock
- Calm Mind

Tapu Bulu @ Assault Vest
Ability: Grassy Surge
EVs: 248 HP / 112 Atk / 148 Spe
Adamant Nature
- Horn Leech
- Wood Hammer
- Superpower
- Stone Edge

Zygarde @ Leftovers
Ability: Aura Break
EVs: 240 HP / 176 Atk / 24 Def / 68 Spe
Adamant Nature
- Thousand Arrows
- Toxic
- Substitute
- Coil