if you have Pokemon platinum graveler learns earthquake at level 45.
same with diamon and periol.
in soulsilver and heart gold at level 39.
white and black at level 52.
And yes i tryed all of them.
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It doesn't learn Earthquake through level up, but it can learn it through the use of the Earthquake TM.
Dig is a TM, so you can teach it to it at any level.
Aggron can learn earthquake by using the TM on it.
Grotle is not able to learn the move Earthquake by leveling or by TMs. It's evolved form Torterra is able to learn Earthquake at level 32.
Level 54 :D