when you receive a gift through mystery gift. most likely for event Pokemon like darkrai
you go in it and pee on your socks for warmth
any pokemart
A green man will only appear in Poke' Marts you have a mystery gift, or via Action Replay.
You can only get the green man if you got a gift from mystery gift a wondercard on wi-fi or you have to go to a real life event like Toy r us to get the Pokemon or a Wi-Fi event
you need cheats walk into pokemart holding landr and he should be there