As a Wurmple: Daybo was a Wurmple for a very short time, evolving very quickly because of the fact he is the early bug Pokemon of the Hoenn region. One of Daybo's biggest successes as a Wurmple was assisting in the capture of Rolic.
As a Cascoon: Once Daybo evolved, Jared was slightly disappointed he evolved into Cascoon rather than Silcoon since he prefers Beautifly over Dustox. While he didn't have many successes as a Cascoon, Daybo did assist in the capture of Warlon.
As a Dustox: Daybo was the best Pokemon on the team at the time the moment he evolved, mainly because he had already reached his final evolution. Daybo was good at taking out a handful of Pokemon in most areas due to the fact he had a wide variety of move types including Poison and Flying. Some of his bigger successes as a Dustox include defeating both Brawly's Machop and Makuhita and defeating Pokemon Trainer May's Combusken.
Daybo fell in the battle against Gym Leader Norman. Daybo took a big hit near the beginning of the battle, which took more than half his health. Then later, Daybo was switched into to fight a Vigoroth, which he managed to poison before being switched out again. It was then when Daybo was sent out to fight Norman's second Slaking, where he was immediately killed by a Retaliate.