Swampert (UU I'm pretty sure), Blaziken (Dream World Ability, SpeedBoost, Uber, JP only, must trade for), Kyorge (Uber), Groudon (Uber), Breloom (OU), Slaking (NU but can hit like boss, just swap between hits), Registeel (UU), Rayquaza (Uber), Jirachi (OU), Deoxys (Varies beteeen formes), Slamence (OU), Metagross (OU, this pokemon knows the Meta!), Latios (OU), Latias (OU), Aggron (RU), Claydol (UU), Cradaunt (RU), Dusclops (UU, Evolves into Dusknoir, evolves from Duskull), Flygon (UU), Hariyama (RU), Medicham (??, gotta check smogon), Manectric (RU), Sharpedo (UU), Sableye (UU), Roselia (RU), Sceptile (RU) done.
Tier order (lowest to highest):
NU (NeverUsed)
RU (RarelyUsed)
BL2 (BorderLine 2)
UU (UnderUsed)
BL (BorderLine)
OU (OverUsed)
Uber (The highest, No restrictions)