Pokémon GO will host the Night Treats event from March 16 to 22 exclusively in Indonesia, India, Malaysia and Saudi Arabia. The event will feature Pikachu wearing a cake hat along with Cherubi, Vanillite, Swirlix, Pumpkaboo and Applin, including their Shiny variants. Trainers in the participating regions can enjoy themed raids, special research and bonus rewards while collecting these festive Pokémon. The limited-time event highlights seasonal and costume Pokémon, giving players a unique opportunity to expand their collections with rare and Shiny Pokémon not normally available outside the event locations.
Source: Official Pokémon GO blog
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