Gengar @ Gengarite
Ability: Prankster/Illusion
EVs: 252 HP / 80 Def / 176 Spe
Timid Nature
IVs: 0 Atk
- Encore
- Perish Song
- Recover
- King's Shield

Enough Speed to outspeed Arceus after Mega and base 100s before Mega. Illusion lets you trap unsuspecting Pokemon that recover thinking you're not Gengar, while Prankster can trap set up sweepers once, although they it is likely they'll switch out.