I used my INFERNAPE,MACHOMP,STARAVIA,SHINX,MIVREUS and my hapiny to beat the fourth gym leader on Pokemon pearl.
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You beat Chuck, the 4th gym leader, in Cianwood city. After you beat him, leave the gym. His wife will come up to you and give the HM to you.
Use dark, ghost, or bug moves.
Head to fuchsia city for your next badge.
I believe that is after you've beaten the 4th Gym in Volcanoridge Town.
Go to Mawille(eletric gym town) and there will be a gym leader... there is no gym leader