Pokémon Go and the forthcoming Pokémon: Let's Go may be all the rage these days, but that doesn't quite mean that mainline titles Pokémon Ultra Sun and Ultra Moon will be left in the dark. Just in time for Halloween, a new online competition for the game called "Ultra Spooky Cup" will feature a host of creepy pocket monsters.

The online competition will permit players to use the "spookiest and creepiest Pokémon" in single battles, such as Ghost-type Pokémon, Pokémon with a "sinister visage" (the example given by the Pokémon Global Link blog post being Midnight Form Lycanroc), Mythical Pokémon, and even Pokémon like Pikachu and Eevee who wear fun costumes for the occasion.

Players will be able to receive a shiny Mimikyu—you know, that adorable/terrifying ghost that dresses up like Pikachu. Those who complete at least three battles in the online competition are eligible to receive the shiny Mimikyu. Players can sign up for the online competition from October 18 to 25, with the competition lasting from October 26 to 28. Ultra Sun and Ultra Moon will also be getting some Mythical Pokemon like Zeraora through events.