The set also debuted a number of other Pokémon, including the lines of the Kalos and Galar first partner Pokémon, Eevee and its Generation I Eeveelutions, as well as a ShinyCelebi. The inclusion of the latter was a likely reference to the one that appears in Secrets of the Jungle, the initial release date of which would have closely coincided with the intended launch of Pokémon Mezastar, if not for their postponement due to the COVID-19 pandemic.
Players accessing the Mezastar Club while this set was in operation would unlock a digital Support Pokémon Ticket that could be scanned when playing Get in Battle! mode, adding Complete FormeZygarde to the player's Support Pokémon roster for that session. Three Partner Pokémon were also available to players with Memory tags with the launch of this set: Grookey, Scorbunny, and Sobble.