Parasect is fine (in doubles). It fits very well on Trick Room, Rain Dance, or Trick Room/Rain Dance teams; it's got plenty of excellent support moves like Spore, Rage Powder, and Wide Guard; and its balanced stats allow for both physical and special sets (and it learns some useful stuff like Knock Off).
All it needs is some higher stats across the board (EXCEPT for speed) and it'll be fine.
Alternatively, just retcon Amoonguss out of existence.
>>27329855>Give dat nigga 30 more speed or soFuck no, that would ruin its usefulness under Trick Room.