Apparently it's still the 120 kanto pokemon and they don't need OT like Chappy already mentioned above me. However, you also need to evolve around 38-40 pokes. Still not sure on the number precisely, but that is the area where the island opened back up.
I admit, I was butt hurt when I thought it was OT, but the evolution clause is a good addition. That way you at least need to do some work. I do however wish the guy would give a riddle, or something alluding to the evolution thing, because I was running on pure speculation from other players, often sincere, but sincerely wrong. I really should look at the forums more, I didn't know anyone saw this. lol