Latias and SD. Maybe use a dark weak poke in the last slot. Although I wouldn't use a spinblocker, because it would put you in the "Milotic sucks and I should use Jellicent" paradox.
Milotic was only OU in an ancient metagame, before the other water pokemon got better. An ancient metagame without Life Orb, or powerful attacks like Close Combat, Thunder Punch, and Outrage. Even Slowbro got Slack Off in DPP. :(