The Pokemonite are just an extension of eviolite in the other direction. They boost fully evolved Pokes with higher stats, potentially a different ability, typing, and design. I think it's quite neat and hope it will actually be useful (ie, they'd better transform on their own without using a move). I'm salivating at a faster Absol with more attack and speed plus Magic Bounce. MegaEvolutions allow older Pokes to be boosted in battle without forcing the player to permanently evolve them into a different design. All the people who complained about Misdreavus->Mismagius or Magmar->Magmortar should be happy. I'd thought about something like this for making Zen Mode Darmanitan useful. It'd need an item to keep it in forme.