So far I can think of:
-regional birds
-regional mammalian shitmons
-regional bugs
-legendary trios (and trio masters)
-a third hidden pokemon that is tied to a pair of box legends
-the psuedos
-scientifically-created weapon-mons (Type: Null at least says we're starting a trend)
-sprite-like/fairy-like mythical pokemon
-two-stage fossil pairs

Did I miss anything?