Well, i'll just list some in a random order. There is no way to tell how good some Pokemon would do in OU without their hinderance, but we can guess.
Before I list anything, I want to state that any Pokemon that is weak to Stealth Rocks or has weaknesses to common types such as Ground, Ice, Fighting, etc. would probably be better off in OU, therefore i'm not listing things because of their weaknesses unless they have a lot.
• Regigigas (Abilty)
• Slaking (Ability)
• Archeops (Abilty)
• Kyurem (Lots of weaknesses, weak to Stealth Rock)
• Abomasnow (Weaknesses)
• Rotom Freeze and Rotom Fan (Inferior typing to Rotom Wash, Heat, and Mow)
• Aurorus (Horrid typing, inferior to Abomasnow)
As I said before, I can list loads more because of their typing, but there is just too many to put.