Easy. Catch and train water/grass Pokemon, and if it's strong enough, you can use typhlosion. I know from experience. He's not THAT hard to beat, but to me, he was, since I used weaker Pokemon to train them. But, if you use water/grass Pokemon moves, it should work out for you.
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After you've beaten Brock go beat the other six leaders then you can fight Blue
at level 36 he wil be a tysplosion
to pewter city
after you beat brock in pewter gym
Brock gives it to you after you beat him in kanto