The Earthquake TM is in the Relic Castle, but is only accessible after you complete the main story.
Yes it is there but you have to encounter volcarona first then go up to again and its in front
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TM26 (Earthquake) can be obtained inside Relic Castle after beating the Pokémon League (Elite Four). It's on the first floor, in the room that leads to the exit to the northwest of the desert, near the stairs.
The Pokemon Aggron is the final evolution of the Pokemon Lairon, which evolves at level 42. It is not able to learn the move Earthquake through leveling, but it can be taught Earthquake using TM26 at any time.
You find the TM Earthquake inside Victory Road.
After the earthquake, you go to Lake Valor.
TM 26 Earthquake can be found in the Relic Castle