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

[Dragonstrike]

Oh, and could a Ditto potentially turn into one of those Extinct Deltas and be able to utlize those Mega Stones?

I can answer this one with how it works in the games: no, giving a Ditto a mega stone doesn't work.  Ditto can't utilize mega stones at all.

What a Ditto can do instead is Transform into an already mega evolved pokemon, thus having the increased stats without the penalty of needing to hold a specific item.

Even if it did work, Ditto would need to see the pokemon in question to be able to Transform into it. And that's kinda hard to do with extinct species.