Pidgey evolves in Pigeotto at level 18 and then into Pigeot at level 36
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In Pokemon Yellow Onix does not evolve, it is a one stage Pokemon.
Lv 16.Pidgeot evolves at Lv 36.
you can evolve balbasaur to venasaur
fearow
Spearow evolves at level 20 in Pokemon Yellow.