The earliest one you can catch is in the grass just west of Viridian City, on the way to Victory Road (Route 22). Aside from there, there's Route 3 (between Pewter City and Mt. Moon), Route 4 (between Mt. Moon and Cerulean City), and Route 23 (between the reception gate and Victory Road).
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You get mankey in Pokemon yellow by going to the grass on the way to the Pokemon league. It is going to be from level 3 to 5.
Mankey evolves into Primeape at level 28
You can catch a grass type Pokemon but catching mankey is the easiest because it appears a lot especially to the east of Pewter (where Brock is). Mankey has the advantage of being a fighting Pokemon which is super-effective against Brock's Pokemon.
you can find a mankey on route 1 and 2
Mankey evolves into Primeape at level 28.