On their way to Lake Valor for the Grand Festival, Ash and his Gang stop off for a break. Upstream, a Pokémon Ranger is attempting to capture a Heatran. Nearly captured, it flees before the capture is complete with the Ranger falling in the river. Saved by a Feraligatr, he greets Ash and company and introduces himself as Ben. He asks for their help in capturing the Legendary Pokémon and they agree. The feat will not be as simple as he wishes, for Team Rocket has also set their sights on the Lava Dome Pokémon. Will Ben and his new friends capture the fiery Pokémon and save it from harm or will Team Rocket finally get their clutches on a powerful legend?
There is no Professor Oak's Pokémon lecture following this episode, instead being replaced by a trailer for the thirteenth movie.
Despite having being made a Partner Pokémon by Ben in the Pokémon Ranger: Guardian Signs specials, Ukulele Pichu does not appear in this episode.
Background music from Pokémon Heroes, Destiny Deoxys, and Pokémon Ranger and the Temple of the Sea is used.
Similar to the previous two Ranger specials, the English dub of this episode followed a different order than the Japanese order when first aired, airing between A Grand Fight for Winning! and For The Love Of Meowth! so as to be closer to the release of its respective Ranger game, in this case Pokémon Ranger: Guardian Signs.
Unlike the Riolu specials, this episode was returned to its original position in the season after the first airing. However, Pokémon.com lists its placement in dub season 13 before Keeping in Top Forme! rather than after it.
At one point, Jessie calls Ash by his name instead of calling him a "twerp".
When Brock says that normal Heatran can't use Eruption, Dawn's hat has some strange lines.
In the Japanese version the Narrator mentions during the opening and closing monologues that the gang are on their way to Valor Lakefront for the Grand Festival, however due to the dubbed episode being postponed so it could air nearer the release of Pokémon Ranger: Guardian Signs (at which point the gang were now on the way to Sunyshore City) both speeches are changed so that the group's destination isn't mentioned.