Not sure if this should go on the Fan Games forum? But here, have my two cents.
ArtsyTheo on Twitter has an AU that delves into what could have been if Clefairy had been the Pokémon mascot instead of Pikachu. Naturally, that includes Clefairy clones and additional forms, including a Mimikyu send-up (called Copippy) that disguises itself as Clefairy instead of Pikachu!
Pokémon Xenoverse was pretty hit-or-miss wits its Fakémon, but Pepequeno and Scovile, a Fire/Grass family based on chili peppers, had my heart from the moment I saw them. From those games, I also liked Bremand, a Sound-type mon with four different forms based on the Musicians of Bremen - my favourite being the Drummer/dog form. What they really killed it with, however, was the X Pokémon - quasi-regional variants from another universe! Out of all those, my favourites were the Cacnea line (Grass/Ghost), the Gastly line (Dragon, with Gengar being Dragon/Psychic), Greninja (Dark/Fire) and Pikachu (Sound if male, Fairy if female).