Routes 111, 114, Granite Cave, Magma Hideout, Victory Road and Safari Zone. They are pretty common.
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Geodude, Dunsparce, Zubat and some water pokemon.
Geodude evolves at lv. 25.
geodude and onix
In Pokemon Leaf Green/Fire Red, you can catch: Clefairy (rare) paras (very common in certain places) zubat (common in most places) and geodude. (common in same places as zubat)
Geodude and Nosepass.