Kakuna is not really good for the battle. It is simply an intermediate state cocoon that eventually evolves into a decent Bug Pokemon. Yet what could be more humiliating than to beat an opponent with a human Kakuna? Poison Sting working against Grass and Bug Pokemon - so use it to poison your opponent, Harden and repeat again and again to drive your opponent nuts. When fighting against a Kakuna, simply burn it to a crisp with a Pokemon Fire. It will not much of the fight because of his attacks and is suitable for the fight against this type. Tips For Pokemon Ruby | Kakuna
Kakuna is not really good for the battle. It is simply an intermediate state cocoon that eventually evolves into a decent Bug Pokemon. Yet what could be more humiliating than to beat an opponent with a human Kakuna? Poison Sting working against Grass and Bug Pokemon - so use it to poison your opponent, Harden and repeat again and again to drive your opponent nuts. When fighting against a Kakuna, simply burn it to a crisp with a Pokemon Fire. It will not much of the fight because of his attacks and is suitable for the fight against this type. 
