After you get an event on wi-fi or special event he will be in a pokemart
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get the mystery gift or get a action replay
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.
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.)
the trainer that has bagon in platinum is at the cave where u find heatran the old man near the entrance to heatran has it
You can get a black belt from a man in a residence on route 221