duel Weevil lvl 10, he runs Petit Moth. You then have to take it with Exchange, or destroy it and revive it with Autonomous Action Unit, or take control of it twice with Enemy Controller (don't know if this works though: I don't know if the equipped Cocoon destroys itself when Petit Moth returns control)
I converted mine as well but was able to use exchange on level 10 Weevil to access a petit moth for the task. Just make sure you protect it with windstorm or switch to def with labyrinth after summoning and equip. Using switchroo helps get the cards you need since must leave on field for 6 turns
Anyone know how to get more petit moth cards, I accidentally converted it.