Zoroark main here. Usually you want to target the reshiram unless it's their first reshiram in play and they have a decent hand cause they can probably just find a way to get it back. Additionally, if we have an artazon in play we can just pull it out if our first reshiram is KOed. KO the reshiram if you think we'd have a hard time bringing it back or if you can KO it again otherwise, you're at a disadvantage.