Download full size inforgraph here.
Tapu Lele, it’s here, it’s not shiny yet, and I don’t see it getting a lot of use in PvE or PvP. Its something that everyone needs one of, so get them early in case the new wears off and people lose interest.
Metagross tops the list, it does that a lot, so you need to get one, trade for it, TM a good one, what ever you need to do. Oh, and a shadow one is even more tops. I have a shiny Dialga set with steel moves just for this kind of raid, you should have more than one powered up, get one!
Go to the official counters page for a complete list, including shadows and megas to see how your Pokémon perform.