Pokémon : S5 | E24 – A Tyrogue Full of Trouble

The group emerges from a cave and spots a sitting Pokémon wearing a neckerchief. Ash checks his Pokédex, which identifies the mystery Pokémon as a Tyrogue. Brock tries to give him some food, but the Tyrogue refuses the offer. As Brock checks his bag for more food, the Tyrogue swipes three containers of food and runs off with them. It sends out a call for help, and a storm of chestnuts rains down on the group. Tyrogue makes his escape while his friends, a Mankey and Primeape, leap out of a nearby tree. The Tyrogue tosses the food to them and they all climb up a cliff. Bayleef is called out to assist, but her Vine Whip causes a rockslide. Just seconds away from getting squashed, a man followed by a Hitmonchan and Hitmonlee destroy the boulder. The trio of Fighting-types flee the scene.

The man turns his attention to Ash and his friends, and slides down the cliff to meet them. He figures that Ash must be heading towards Mahogany Town. Ash confirms this and shows off his six Johto League Badges. The Storm Badge captivates the man's attention, and he is surprised that Ash defeated Master Chuck. The man introduces himself as Chuck's protégé, Black Belt Kiyo. He escorts the group to his training camp and offers them food. He explains that he is training for the P1 Grand Prix event. He says that the Tyrogue from earlier has been causing a lot of ruckus in the foothills area. A villager suddenly alerts Kiyo to another incident, this time at a farm property.
(Source: Bulbapedia)