While en route to Ecruteak City Ash and co encounter a bush with legs. The legs in question belong to an Ariados. While trying to catch it they encounter Koga's sister Aya who is also trying to catch it. Little do they know that catching the Ariados, which belonged to her sensei, was part of her training. The sensei then invites Ash and his friends to train at the dojo. What will Ash and friends learn at this dojo?