Water, dark and grass Pokemon
get a pokemon, then you train it, get it really strong, and beat th ecrap out of all the 7th leader's pokemon. Its easy.
The seventh gym leader
go and beat the 8th gym
Go to Mawille(eletric gym town) and there will be a gym leader... there is no gym leader
go to the seventh leader. -_-
Beat the 8th Gym leader.
Beat the gym leader
get better pokemon
the best way to beat the 7th gym leader is with a fire type Pokemon
Press the switches to move around the statues and use the portals to the navigate your way to the gym leader's.
go to sunnyshore city
You first beat Fantina and then go to Celestic town.