Sorry you cant. But you can become champion of Sinnoh but you wont be able to face challengers or anything. Its just the name lol. It would be fun if you could then you could face all of the trainers. I hope they will do that in the 6th generation of pokemon.
No! You can't become a gym learder in any of the games...
No
bye dying
The 6 gym leader in at Canalave City. the gym after the hearthome City gym!!!!!
The 6th gym leader is in Canalave City.
no you can not become a gym leader in any game.
No because who would you face it is a tridition to have 8 gyms
The first gym in Pokemon diamond is in Oreburgh City
his name is leader byron.
by winning a contest and by defeating the pastoria gym leader
just beat the fourth gym leader
It is Candace, The Ice-Type Gym Leader.
Go to the lighthouse and the Gym leader should be there.