Well, there's (45) Temple to the Light (Abandoned), which is pretty obviously a trap, but seems rather important, and there's #1 Rancha the Breloom, and #31 Lexin the Flygon, who seem like they could be helpful.
I think I might Investigate Rancha to start, since I don't think we ever used it last season, and I kinda wanna see it in action. Besides, for two cycles, I'm assuming it's gotta be pretty useful.
Not positive yet, though.