in the pokemart after you use mystery gift.
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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.
A guy in a green suit will only appear in a Pokemart if you have participated in a Pokemon event. For a list of events, click the link below. (In "related links")
You need to be more specific. LUCKILY, I know what your reffering to. You are talking about the arceous event in diamond/pearl/platinum. He will be in any pokemart in a green suit. After you have activated the event.
in any pokemart near the counter.
The man in the green suit comes only when you activate a Pokemon mystery event (for example if you own Pokemon battle revolution for the wii you can buy things and send them via mystery event to your ds. The green man will then give you whatever you bought.)