>>29411378The single stage mons will likely be self-sufficient.
The ones in Kalos were
Furfrou
Dedenne
Carbink
Hawlucha
Klefki
The latter two are self-sufficient. Diancie is an unrecognized evolution of Carbink, doing everything it does but better. Dedenne is a Pikaclone so it gets a pass. Furfrou is the only one that's ineffective but it was kind of a gimmick mon considering its novelty was in being customizable. Besides, it got a crazy ability that perhaps GF overestimated considering it has no reliable recovery options.