Many. 1. Uxie mesperit azelf: because then the whole protecting against dialga and palkia thing would make meer sense. Roar of time and spacial rend deal massive damage to them with out it. 2. Cressilia: shes pink, power of dreams, signiture verplaats 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 door 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.