The next Gym Cup in Pokémon Duel will be the Poison Gym Cup and will give the reward of a figure for Alolan Raichu. The date for the Gym Cup has yet to be announced, but this Gym Cup includes the effect of powering up Psychic-type Pokémon figures. Full details for this event have yet to be revealed, but stay tuned for any updates. Pokémon Duel was recently made available for Kindle Fire devices via the Amazon App Store.
Source: Serebii
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