A Blissey I can always use in competitive.
Nature:Timid
Ability:Serene Grace
EVs:4 HP, 252 SpAtk, 52 SpDef, 200 Speed
Moveset:
Ice Beam
Seismic Toss
Softboiled
Aromatherapy
Blissey already has low defense, so there is no real point wasting EVs on it, when its max Defense can only be 130...