The Pokémon Company released the
Pokémon: Fireworks Celebration! (ポケモン 花火を打ち上げよう!) LINE set on August 8th, 2024 for 300 yen (including tax) or 100 LINE Coins. Are you ready for some summer festival fun? Check out these adorable Pokémon effect stickers, perfect for the summer season! Light up your chats with fireworks in this set. Effects are played in the chat screen background.
Sources:
https://www.pokemon.co.jp/goods/2024/08/240809_ph01.html and
https://store.line.me/stickershop/product/32111/en