You must defeat the Elite Four and go to Kanto, and walk to Pewter City.
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Where you beat Brock. An old man is standing in a garden.
yes everyone has a surname even in pokemon and brock also has one but it is not mentioned in the pokemon anime
defeat brock blaine misty ericka poison leader and all the other gym leaders
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.
Onix.