You gotta have a Pokemon who knows earthquake or other ground-type moves.(just make sure you don't have any water-type cuz electric types are effective against water types).
Wext.
electric type Pokemon
Raichu, Pikachu, and Octillery, I think.
The 8th gym leader is in sunny shore city
you just need to explore the upper floors of sunyshore city and voiala! you have the 8th gym
Sunnyshore City
The 8th gym leader has a LV. 46 Raichu, a Lv. 47 Ambipom, a Lv. 48 Octillery, and a Lv. 49 Luxray
The 8th gym leader is in Sunyshore City not out of town, he's just up in the beacon lighthouse.(at the top)looking through binculars. this is for Pokemon diamond and pearl!
== == You get the 8th gym badge in Sunyshore City. Hope this helps
what do you do after beating the fouth gym in pokemon pearl
It is not possible to reverse the order of Gym Leaders in Pokemon Pearl. This is due to how the story of the game is written. And the fact that the 8th Gym Leader will be impossible to beat at the start of the game.
we can get 8 gym badges byfighting all the gym leaders in Pokemon pearl.