Forever the Recusant
from the first post: Receiver only works when your ally faints while the Pokemon with the ability is on the field, it does not work on opposing Pokemon. (yetanotherperson) Receiver does not copy Wonder Guard. (Source)I don't know if this has been answered yet, but I'll still leave it here just in case:
Does Receiver and/or Power of Alchemy work in singles? Are there restrictions as to what they can copy?
I don't keep the first post updated for the fun of it and "are there restrictions" is super vague please keep questions specific so our testers know what to go for.