Fierce Fighting Entei! War Cry of Flames!!

Pokémon Horizons: The Series episode 78 is “Fierce Fighting Entei! War Cry of Flames!!”. The Rising Volt Tacklers continue to investigate the reports of Entei sightings that surround an archipelago. A new island formed by recent volcanic activity has been discovered by the group, which consists of Volt, Wattson, and Surge. There, they meet a Pokemon researcher from the island who shares information about the Entei sightings.

Intrigued about the sightings, the Rising Volt Tacklers decide to check them out firsthand. They begin by examining inside the volcanic crater. As they venture deeper inside the crater, they encounter plenty of displaced Pokemon due to the recent volcanic activity. Some of the Pokemon the group finds include Growlithe, Arcanine, and Flareon, all being fire-type Pokemon well-suited for volcanic terrain.

The Rising Volt Tacklers, however, went on advancing. Finally, they were nearing an immense clearing. Right at the heart of it, they found standing tall an Entei, one of those mythical Pokemon which had long established already their fame as the “Volcano Pokemon” because, according to them, they consider it a kin to be with fire and volcanoes.
They welcomed meeting it. However, right away they noticed that something was not in concurrence. They wanted an actual other legendary creature known only by its name-Entei-one of the three legendary creatures of the new continent of Johto aside from Raikou and Suicune, according to them in myths, roam with the land together. That might be their probable source to find another. On the other hand, no matter what, the two realized to challenge this to face their battle with him in this Entei. And of course, Entei would receive such a challenge by beating their opponent in a pathetic manner.

The Rising Volt Tacklers were using their electric-type moves to battle Entei. Volt used his Jolteon, Wattson used his Magneton, and Surge used his Raichu. Entei was extremely powerful, but the Rising Volt Tacklers were able to hold their own.
The two sides of the battle had been dishing out heavy punches for some time. Eventually, Entei began to tire out. The Rising Volt Tacklers took this as their chance and fired one last attack. It worked and Entei was beaten.
Entei was awed by the strength and determination of the Rising Volt Tacklers. Nevertheless, it did not come with them on their quest for the other two legendary beasts. Entei explained that it should continue roaming the land, and protecting its territory.
The Rising Volt Tacklers were disappointed that Entei would not come with them. Still, they respected the choice. They thanked Entei for the battle and continued onward.

As the Rising Volt Tacklers are leaving the island, they see lightning that has appeared in the distance. They think this has to be Raikou, one of the three legendary beasts. They believe that following the lightning must lead them to Raikou.
The Rising Volt Tacklers set off on a new adventure to search for the remaining legendary beasts.
This is just a summary of the storyline of the episode. The episode has much more moments and scenes. If you want to know more, watch it yourself.