Pokémon Strange Journeys: The Rise of Dr. Eggman

Pokémon Strange Journeys: The Rise of Dr. Eggman is a 2015 Japanese-American-British animated film and the first in the Pokémon Strange Journeys film trilogy. It was produced by Satsuki Film Company and released on August 7, 2015, just after the first season of the television series ended.

Premise
Dr. Eggman, having captured Ash's friends after they left, plans to take over the entire Pokémon universe, and it's up to Ash and his friends to stop him.

Critical reception
Much like the TV series, this movie received mixed-to-negative reviews, mostly due to the incredibly juvenile writing and personalities of some of the characters, as well as its questionable inclusion of Sonic the Hedgehog characters and severe padding.

Trivia

 * This movie features pretty much all of Ash's friends from the entire Pokémon TV series, right down to the one-off characters (including Duplica from the Indigo League episode "Ditto's Mysterious Mansion", and Molly from the movie Spell of the Unown).
 * Ash's Pikachu makes his comeback in this movie, since he was captured by Team Rocket at the beginning of the TV series.
 * This was the first film produced by Satsuki Film Company to be distributed by 1happycats Productions, who would later purchase the company in 2018, before splitting back up the year after.
 * This is the longest film from 1happycats Productions and Satsuki Film Company to date.