Satoshi, Pikachu and their friends receive a mysterious message from Arceus, the phantom Pokémon. They meet up with their old friend Takeshi and set off for Mount Tengan to find out more. There they come across a rampaging Heatran and the people behind it: Team Galactic, a group everyone believed had been broken up. Its commanders are set on tracking down their missing leader by opening a gate between dimensions. Backed by a trio of Legendary Pokémon and Shirona, the Sinnoh Champion, the heroes have plenty of support, and they will need every bit of it to save Sinnoh. The four-episode action and fantasy adventure special was first streamed on Amazon Prime to mark the release of the game Pokémon Legends: Arceus.