You can get the Earthquake TM in Victory Road and you can also buy it in the Battle Frontier.
Additionally Diglett, Geodude, Rhyhhorn, Wooper, Swinub, Donphan, Larvitar, Marshtomp, Numel, Trapinch, Barboach, Groudon, Torterra and Hippopotas are all capable of learning Earthquake.
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Victory Road..
Tackle is not a TM.
there is no TM for ancient power.
You find the TM Earthquake inside Victory Road.
TM 26 Earthquake can be found in the Relic Castle