Phanpy does not learn Earthquake by leveling up, however its evolution Donphan can learn the move at level 46.
you must find the TM or level up.thoose are my best suggestions
In level 37
Hippopotas evolves into Hippowdon at Level 34.
Hippoppotas evolves by level. Get it to level 34.
In Pokemon diamond and pearl golem learns earthquake at level 33
Empoleon can't learn Earthquake by itself. But you can teach the TM Earthquake, which can be found at Wayward Cave.
It cannot learn Lava Plume in Emerald because Lava Plume was not created until Diamond and Pearl came out. It will learn Earthquake at level 37 and Eruption at level 45.
Venusaur can only learn Earthquake through TM26 Earthquake.
It doesn't learn Earthquake through level up, but it can learn it through the use of the Earthquake TM.
Aggron can learn earthquake by using the TM on it.
Hippopotas evolves into Hippowdon at Level 34.
Camerupt learns Earthquake at level 49.
Grotle is not able to learn the move Earthquake by leveling or by TMs. It's evolved form Torterra is able to learn Earthquake at level 32.
Metagross can only learn Earthquake with the use of a TM.
Nidorina cannot learn Earthquake by any method.
Rhyhorn will learn earthquake at level 52. However, if you evolved it at level 42 into Rhydorn you will have to wait 6 levels later than normal to learn earthquake.
Hippopotas evolves at 34 into Hiooowdon
Hippopotas evolves at Level 34.
he dont learn it