After you meet him in the lighthouse at the bottom-right most area of Sunnyshore city. Talk to him and he will return to his gym.
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You will need to defeat Volkner, the Sunyshore City Gym Leader.
Volkner,Gym number 8.He has ELECTRIC type pokemon.The clever Volkner must know that Octillery isn't an Electric type,it's a water type.
The eighth gym leader of Sinnoh, Volkner, returns to battle you again in Platinum after you beat the Elite Four. When you get to battle frontier, you and your rival have a double battle against Volkner and Flint, an Elite Four member.
West of the hotel where the guy used to say there was a power outage.Go down the stairs and after a few trainers,you will be at Sunyshore City where Volkner's Gym is.
The gym leaders are Roark(rock),Gardenia(grass),Fantina(ghost),Maylene(fighting),Wake(water),Byron(steel),Candice(ice),and Volkner(electric).