This Tretta was awarded as a prize at the Ultimate Challenge event held at the 42nd Next Generation World Hobby Fair, which took place at Makuhari Messe, Chiba on June 27 and 28, 2015. It was awarded again in the same manner at several later events. Details of these events are as follows:
- As part of the Pokémon Tretta Ultimate Challenge Tour, held at Aeon Mall Asahikawa West, Hokkaido on August 1, 2015; at iias Sapporo, Hokkaido on August 2, 2015; at Seven Town Azusawa, Itabashi, Tokyo on August 9, 2015; at Aeon Mall Kashiihama, Fukuoka on August 15, 2015; at Aeon Mall Fukuoka on August 16, 2015; at Shopping Plaza Kamagaya, Chiba on August 23, 2015; at Aspia Akashi, Hyōgo on August 29, 2015; and at Ito-Yokado Ario, Yao, Osaka on August 30, 2015.
- As part of the Pokémon Center Summer Festival in Centrair, held at Chūbu Centrair International Airport between August 13 and August 16, 2015.
- At participating Pokémon Centers and Pokémon Stores across Japan on October 3, 4, 10, 11, and 12, 2015.
- As part of the Tohoku Children's Expo, Sendai on October 11 and 12, 2015.
- At Seven Town Azusawa, Itabashi, Tokyo on November 15, 2015.
- At Shopping Plaza Kamagaya, Chiba on November 23, 2015.
- At participating Namco arcades across Japan on November 28, December 6, 13, 19, and 20, 2015.
The Ultimate Challenge featured a team of Pokémon that appeared as Ultimate-class Tretta in the first three Pokémon Tretta Ultimate series sets: a Shiny Mega Rayquaza, a Kyurem, and an Arceus. While the opposing team was fixed for all events, the Arceus encountered could one of several types. Its Grass-type, Fire-type, and Water-type forms could be an opponent prior to the nationwide Pokémon Center and Pokémon Store events, expanding to include its Fighting-type, Steel-type, and Poison-type forms from those events. Players who managed to fill the Catch Gauge of any one Pokémon were awarded either this Tretta or a Kyurem Tretta at random. Players who did not manage to defeat any Pokémon at these events were instead awarded either a White Kyurem, Black Kyurem, or one of two Mewtwo Tretta as a random consolation prize. Participants with the top 10 highest scores in the event held at the Tohoku Children's Expo and all subsequent events were also awarded a certificate. An Arceus Tretta was added to the available prizes starting with Ultimate Challenge events held at participating Pokémon Centers and Pokémon Stores in 2015. It was available at all subsequent events with the exception of the event held at the Tohoku Children's Expo.
The possible teams present at each Ultimate Challenge are detailed below.
