You just train your Pokemon heaps.. and its really easy i got on my 1st shot..
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Mt. Mortar after winning at Blackthorn Gym. You will need a Pokemon that knows waterfall and an open space in your party because he will give you a Tyrogue after you beat him in a Pokemon battle.
you need to beat the 8th gym leader in blackthorn city. glad to be of service.
beat the Pokemon luegue then go to the Pokemon centre
nothing
Go to Ice Path and when you get out of there,you will end up in Blackthorn City,which is where you need to be for your next gym battle.