New Nintendo Switch system icons based on Pokémon Scarlet and Violet The Hidden Treasure of Area Zero have been added for Nintendo Switch Online subscribers. Different icons will be available for 6 weeks from December 12th, 2023 to January 18th, 2024. Character icons cost 10 Platinum Points.

Wave 1: December 12th to 14th, 2023: Kieran, Carmine, Dipplin, Poltchageist, Terapagos, Ogerpon, Iono, Grusha
Wave 2: December 14th to 21st, 2023: Archaludon, Florian, Juliana, Sprigatito, Fuecoco, Quaxly, Terapagos, Mela
Wave 3: December 21st to 28th, 2023: Ogerpon, Okidogi, Munkidori, Fezandipiti, Juliana, Florian, Armarouge, Ceruledge
Wave 4: December 28th, 2023 to January 4th, 2024: Lacey, Crispin, Amarys and Drayton, Rika, Poppy, Larry, Hassel
Wave 5: January 4th, 2024 to January 11th, 2024: Bloodmoon Ursaluna, Sinistcha, Briar, Perrin, Ogerpon, Miraidon, Koraidon, Terapagos
Wave 6: January 11th to January 18th, 2024: Raging Bolt, Iron Crown, Cyrano, Terapagos, Pikachu, Eevee, Pawmi

Source: https://topics.nintendo.co.jp/article/6aebe4ef-2d96-45a9-a843-745e046195b7#icon and https://twitter.com/NintendoAmerica/status/1735751587727847519