Silph Co.
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It's in kyogre's cave
Earthquake (TM26) is your reward after you beat Giovanni
TM 26 (Earthquake) is a reward for beating the 8th Gym Leader in Viridian City
go to seafloor tavern..... you'll see a pokeball and pick it up.... there TM 26 Earthquake
Garchomp actually doesn't learn earthquake by increasing lvl....but it learns through tm26(which is earthquake).