Pokemon diamond where to find TM earthquake?

Answer 1

Things you'll need: Cut, Strength, Bike

First, you need to go to the secret entrance of Wayward cave. It's under Cycling road, next to the regular entrance. Go north all the way until you see the black entrance to the cave. See it? DO NOT GO IN. That's obviously not the secret entrance. Instead, you'll need to go underneath the road (so that you can't see yourself). Go north until you stop. The entrance is on the left, just keep trying to go north while moving around and you'll find it.

Good, now you're in the cave. You'll need Strength to move the boulder, then go to the left. Don't worry, you don't need Flash. Go down the stairs on the left. Now you're in a bigger room which is (thankfully) illuminated for you. Use the fast gear on your bike to go up the first two ramps on the left. Then you'll need to hop over 4 of the small bumps with the bike, so you can get the Max Ether there. Then, go up, left, and jump over the ledge. The next step is important. You need to change to the slow gear on your bike, then hop over the bump. Hopefully, you'll land one space over. Go down and around, back up, then left. The hard part is over, so go to the left all the way. Pick up any items you see lying around. I believe you can get a Grip Claw and a Revive. Make your way to the far right side of the cave, then go down all of the stairs. Go up the stairs on the right and you'll be in a room with Earthquake!