You can get TM Earthquake in relic castle after you get the National dex. If you on the 3rd floor, you'll see a new path has opened, leading you to a room with a hidden item, and the TM. You can also find 1 of the seven sages and a level 70 volcarona, who evolves from a larvesta!!
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You find the TM Earthquake inside Victory Road.
TM 26 Earthquake can be found in the Relic Castle
That TM is in silph co.
at a place
you can get it in seafloor cavern