HOW TO BEAT BROCK WITHOUT BUTTERFREE
If you want to beat Brock but you're to lazy to evolve caterpie into butterfree then listen up! Battle all the the trainers you can find (and maybe a few wild pokemon, if nessecary) until your pikachu reaches level 20. It should learn slam. This is how I beat Brock.
More tricks, tips and cheats for this game are right here - Pokemon Yellow: Special Pikachu Edition cheats
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