Which Pokemon do anda think should be Fairy type?

Many.
1. Uxie mesperit azelf: because then the whole protecting against dialga and palkia thing would make lebih sense. Roar of time and spacial rend deal massive damage to them with out it.
2. Cressilia: shes pink, power of dreams, signiture pindah is a magical sacrifice (similar to the winx earning there enchantix) and most importantly, so darkrai can be part ghost with out him becoming to powerfull against cressilia.
Melleotta: changes from singer to ballerina oleh a song, small, feminine and can learn dazzling gleam.
Jirachi: grants wishes.
Pichu/pikachu/riachu: there part of the fairy egg group.

Pokemon that shouldnt be fairy type but are:
Mime jr./mr mime.