Ep 15. Nerves of Steelix!

Ash and friends are still on their journey towards Olivine City in order to earn their fourth gym badge. As they walk through a rocky terrain, they come across a Steelix boulder blocking their path. Suddenly, a boy named Mateo arrives and uses his psychokinetic powers to move the boulder out of the way.

Mateo explains that he is a student of a renowned psychic named Professor Sebastian who has been studying the use of psychokinesis on Pokémon. Mateo is traveling to see Professor Sebastian in order to show him his abilities and hopefully study under him.

On their journey, they encounter a Magnemite that is stuck in a crevice. Ash and Pikachu try to save it, but the crevice begins to cave in. Mateo uses his abilities to stop the cave-in and save both Ash and the Magnemite. They continue on their journey and come across an abandoned mining town.

The town was shut down because the miners were afraid of the Steelix in the nearby caves. Mateo decides to investigate and finds out that the Steelix are being controlled by a group of Team Rocket members who are using the psychokinetic Pokémon, Alakazam, to do so.

Mateo is captured by Team Rocket and forced to use his abilities to help control the Steelix as they plan to take over the town. Ash and friends come to Mateo's rescue, and with the help of the Magnemite, they defeat Team Rocket and set the Steelix free.

Mateo finally reaches Professor Sebastian's laboratory and shows him his powers. The professor is impressed and takes Mateo in as his apprentice to learn more about the powers of psychokinesis on Pokémon.

As Ash and his friends continue on their journey, they are confident that they will earn their fourth gym badge and continue to encounter fascinating new Pokémon and amazing trainers along the way.