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.
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Aggron can learn earthquake by using the TM on it.
Aggron doens't learn rock slide in this version
The following Pokemon that you can easily get to learn Flash in Sapphire: Beautifly or Dustox Lotad or Lombre Oddish Gloom
It learns double egde at level 63. Double edge is that last move Aggron learns.
It doesn't learn Earthquake through level up, but it can learn it through the use of the Earthquake TM.