You go to one,two,and three island with Bill.
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beat blaine at cinnibar and then Giovanni at viridian city.
If you have a Pokemon that has a rock type move, then you can easily win. Rock slide works the best.
seafaom islands up the ladder
in blackthorn city
That would depend on the game you're playing however if you're playing FireRed and LeafGreen he will have Pokemon such as Onix, Rhyhorn, Kangaskhan, Nidorino, Nidoqueen, Dugtrio and Nidoking and for Pokemon such as Nidorino, Nidoking and Nidioqueen you can use Psychic-type Pokemon in order to beat them, Rhyhorn and Onix you can use Grass-type Pokemon in order to beat them, Dugtrio you can use Flying-types in order to beat it and you can use Fighting-type Pokemon in order to beat Kangaskhan.