Beating Brock
Since you start out with Pikachu, his electric-type moves will do absolutely nothing to Brock's pokemon. There are two simple solutions to this problem: one, catch a different Pokemon, and use that instead, for Pikachu doesn't have a lot of normal-type moves. Or, you can train Pikachu until it learns Swift. Swift is still pretty weak, but by the time you get it, Pikachu will be at a high level.
We have more cheats and tips for this game here, Pokemon Yellow: Special Pikachu Edition cheats
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