Psycho's Shiny Mewtwo
MEWTWO
Recommended Item: Choice Specs/Life Orb
Nature: Timid
Ability: Pressure
IVs: 31/31/31/31/31/31
EVs: Untouched
Moveset: Psycho Cut, Amnesia, Fire Blast, Shock Wave
or
NESSIE
Recommended Item: Leftovers/Lum Berry
Nature: Adamant
Ability: Water Absorb
IVs: 30/31/31/7/30/31
EVs: Untouched
Moveset: Ice Shard, Dragon Pulse, Water Gun, Dragon Dance