after you beat the 4 gym leader in hearthome city
the fith gym leader in crystal is on an Island in the southwest of Johto. use surf to get to him
you have to defeat the gym leader in the 5th gym or something ...
After defeating Flanery in the 4th gym, go to Petalburg City (the 3rd city) to fight your dad in the 5th gym.
You go to fight your dad as the 5th gym leader in Petalburg city. This happens after you beat the first 4 gym leaders.
The 5th gym is the Fuchia city gym Gym leader Koga
In Lavaridge gym.
go to hearthome city and fight the gym leader there
u fight the gym leader
You do that by going to fight one gym leader
You go to the Hearthrome gym
you cannot be a gym leader in the games you can only fight them... ^_^
You can only fight the Hearthome gym leader after you have gone to Celestic Town.