Passimmian/Mew is a good start. Greninja Break and Sylveon is also a good start as well. I honestly can't think of any others. I am sure someone will post if I did.
I do have the 4 passimians (Had considered it for a while. It looks nice, and I was considering adding a raichu to it cause the bench is usually very large) and have 1, maybe 2 mews. Though I see most lists running running one of lele/shaymin for consistency's sake.