I've worked this out. I want a pokemon who is mainly an Attacking and Special Attacking user. Its Speed is currently 125 for a Lv 50, and I need more power in my Real Team, so its either Speed or Power. I've already got a powerful Speed pokemon, so thats alright. I only need one Tamato berry now, so thats that!
... He wants to be in the credits of the people who helped... I don't have any, and I doubt he'll be online again, but he has surprised me before, so maybe wait and see. Ask him to create a map he's created himself and tell him to screenshot it and put it in his album. You've got to tell him how to do this though, as he is new. Before you accept him, make sure it isn't a copied map of someone elses.