Golett sticks out the most to me. Between Iron Fist, Rock Polish, the elemental punches, and somewhat reliable recovery in Drain Punch, the little guy could easily become a force to be reckoned with.
Storm Drain Giga Drain Lileep will be a terror to take down, especially in sand
Knock Off was given to a lot of stuff. It could find a place in sets looking for a filler move, on teams that would benefit from a dropped eviolite.
Roost Archen could be interesting. it at least makes him somewhat usable.