Recomended team
Try to mix your Pokemon team around
EX; have all your Pokemon in your team a different element (fire, water, electric, grass, etc) that way you will have weakness on your side no matter who your fighting.
Another thing you should do is to make sure you level up each of you Pokemon equally. Tust me, it helps.
If you need more help, we've got more Pokemon Yellow cheats and also check out all of the answers for this game
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