You have to spend lots of time training up your Pokemon until they can beat the foe.
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You have to have defeated the seventh gym leader in Snowpoint city
=you have to of done all seven badges to get there. You shold be able to after then. By the way the 8th gym is in sunyshore city.=
beat snowpoint city gym then get palkia if you have Pokemon pearl or go and get dialga if you have Pokemon dimond then try again then you should be able to get there.
The 8th and last gym is in Sunyshore City.
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.