Fly to pallet town and go south eventually you will reach cinnibar island on the island is a mansion go in and find the secret key and when you do unlock the gym and go in and beat the 7th gym leader.
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TM 26 (Earthquake) is a reward for beating the 8th Gym Leader in Viridian City
After you beat Sabrina, the 6th gym leader in Saffron City, you can use Rock Smash.
You get it when beating the 6th Gym leader, but you can also buy it at the Celadon Dept. Store.
what do you do after beating the fouth gym in pokemon pearl
by BEATING the 7th gym