How to beat Misty in Pokemon Fire Red?

I was wondering how to beat Misty with these pokemon:

Charmeleon: Level 26
Pidgey: Level 15
Spearow: Level 12
Zubat: Level 11
Kakuna: Level 6
Caterpie: Level 5

I also have Pikachu, Rattata, and another Pidgey but there like Level 5 and below.
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