Pokemon the Series: Ruby & Sapphire Season 601 Episode 6 A Poached Ego!

On the road, Ash and friends discover a strange item, and Officer Jenny tells it's a part from a Pokemon poacher's net. Our heroes set off with Officer Jenny to catch the poacher in question, but this time Team Rocket beats them to the punch. The poacher's client has a penchant for Poison-type Pokemon, and the nets are full of Ekans and Koffing (who evolve into Arbok and Weezing). Appalled at the captured Pokemon's bad treatment, Jessie and James attempt to battle the poacher, but they can't get the upper hand...and then, in a rare act of selflessness, they instruct their own Arbok and Weezing to guide the smaller Pokemon to safety and never look back. The villains must bid farewell to these longtime allies, but the loss is balanced when they recruit a Cacnea they met during this misadventure--and later, Ash and company help Officer Jenny catch the poacher, completely unaware of Team Rocket's unusual heroics!