you find it in mount silver when you've beat trainer Red 3 times
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you have to use hm rock smash on rocks to find them.
you find him in the ruins of alph by weeds and you can find smeargle on there same thing on Pokemon heart gold (natu evolves at level 25)(smeargle no evolvetion)
just run in the grass
near safari zone were the grass is
a man in pewter city gives it to you