priere GX will suck for anyone running stage 2's and rare candy, setting them back 2 turns, perhaps more if you follow up with N, or I guess Illima or something in the future. It certainly will be a pain for those 3+ attack cost pokemon.
I feel incredibly slow for this, but I just realized that the Non-GX Tapu Koko has no Retreat Cost, making him extremely versatile for any deck able to run DCE. I'm going to want at least one of those.