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.
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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")
The azure event? you MUST use an action replay and enter a pokemart holding L+R.
in any pokemart near the counter.
any pokemart, but only if you have a cheat you can get it, because the event days for the azure flute are over
they is a guy at 1 of the pokemart but i dont know which 1 is it