Don't want your Pokemon to grow up?
If your Pokemon starts to evolve and you want to stop it, press B. This will not work if a Pokemon is evolving by friendliness or by stone evolution. This can be helpful if you want your Pokemon to learn moves earlier, because the younger the Pokemon is, the sooner it learns attacks.
We have more cheats and tips for this game here, Pokemon Yellow: Special Pikachu Edition cheats
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