Include all tiers and their Pokemon, because the only thing I know is maikarp should be Uber but isn't. :)
Too long to write down,so I will give you sources.
Here is a link to the Smogon tiers, these are the ones the DB uses.
Not going to list them it would take too long.
Use this Link instead to tell you. Just click on the tier you want to find out what Pokemon are in it