Yveltal @ Choice Scarf
Ability: Dark Aura
EVs: 204 Def / 80 SpA / 224 Spe
Tera Type: Ghost 
Timid Nature
- Foul Play 
- Oblivion Wing / Roost
- Defog / Toxic
- U-turn

Yveltal @ Heavy-Duty Boots
Ability: Dark Aura
EVs: 248 HP / 76 Def / 184 Spe
Tera Type: Ghost
Timid Nature
- Foul Play
- Toxic / U-turn
- Taunt
- Roost