A green man will only appear in Poke' Marts you have a mystery gift, or via Action Replay.
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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.
in the pokemart after you use mystery gift.
he is in a Pokemart
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.