I have dialga, regigigas, cresselia, manaphy, groudon, kyogre, regice, regirock, and mewtwo (actually got that one when I was still level 40) but still wondering about the mystery part and secret slab, I do however have a wonder gummi, a quest to get a miracle chest, a golden apple, 5 golden spikes, and 5 rare fossils
my torterra also has full iq and lucario is halfway there
with registeel you might want to try stacking friend items