Within the hive...- evo

Kakuna are cacoon states of weedles.

When the Weedle eat enough they return to the hive and become Kakuna, wrapping themselves in a hard shell made from their silk. They return to be protected by the Beedrill through this crucial time of change.
They are very symilar to Metapods as they attach themselves to things using strong silk.

If weedle get lost, sometimes they turn into Kakunas in trees and caves, these are usually when they get caught by trainers.
It is FAR safer to catch a Kakuna and evolve it than catch a live Beedrill.

As they can still use attacks such as harden etc they are still classed as a pokemon, however they are pretty useless in battle.

Hope you like it.