In Pokemon Diamond Pearl and Platinum, a man in a green suit can be found in the Pokemarts. He is not in any specific city. He is just in every Pokemart.
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A green man will only appear in Poke' Marts you have a mystery gift, or via Action Replay.
in the pokemart after you use mystery gift.
After you get an event on wi-fi or special event he will be in a pokemart
You only find him if you go to a store that's doing a character distribution, then when you get the mystery gift, the man will appear.
when you receive a gift through mystery gift. most likely for event Pokemon like darkrai