Geodude evolves at 25 in Pokemon diamond/pearl/platinum.
but I'm not sure about any of the other games because i have not checked the other games.
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Geodude evolves into Graveller at level 25, which can then evolve into Golem when trading.
Geodude evolves level 25, and then you have to trade Graveler to evolve it into Golem.
Geodude evolves beginning at level 25.
Geodude evolves into graveler at level 25.
Level 25
25