Gigantamax Rillaboom is expected to be part of an upcoming event, possibly related to Max Battle Day. The pokemon is one of several Gigantamax forms that have been introduced in the Pokémon series, including in Pokémon Go and Pokémon Sword and Shield. Details about Gigantamax Rillaboom and other Gigantamax pokemon are being released, including information on how to obtain them and their battle moves.