[Meta thread] Iron's PokeRole Adventure: The Skull Ruins

[Dragonstrike]

We're in a creepy dreamworld with abominations of Houndour and Houndoom, so away with logic!

Well, there might be some logic to hold on to, still.

In the Genesect VS Mewtwo Movie, Mewtwo can Mega Evolve without a Trainer's help.  Maybe it's a special trait for exceedingly powerful psychic types?

Of course, nobody is going to know that in-character.