Celebi - grass/fairy!! Keep its psychic moves, just don't keep it as a psychic type imo. Otherwise....Flabébé and its line should be grass/fairy srsly
I opened the thread to say the exact same thing!
FeraligatrMaster covered some really good examples as well.
When Zeraora was announced, I felt certain it'd be electric/fighting, I think that'd be a pretty cool combination!