You go to Petalburg City then go to the gym and go through four or five doors then you will face the fifth gym leader.
That's the fourth gym leader, fifth badge. If you want the fifth gym leader, sixth badge go to route 118 use surf and go to your left, go up when your stopped by steven and then keep going up.
once you see a big building you can either:
Go in and get a castform for betting team magma/aqua
or
Make a right until you get to fortree city.
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Resources:
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petalburg city gym. That is the one where you 'Dad' is the gym leader. hope this helped.
You get it when you battle your dad which is the fifth gym
The Gym Leader Clay Uses Ground Types.
The 5th gym leader in Johto is Chuck. He is located in Cianwood City.
beat the fifth gem leader than you get the Hm surf