McDonald's Japan has unveiled the Pokémon MEZASTAR Happy Set which will begin on March 4th, 2022 at participating locations. There are 5 different tags to collect.

Pokémon MEZASTAR Tags:

Pikachu & Arceus (ピカチュウ & アルセウス)
Pochama & Palkia (ポッチャマ & パルキア)
Hikozaru & Dialga (ヒコザル & ディアルガ)
Naetle & Giratina (ナエトル & ギラティナ)
Riolu & Darkrai (リオル & ダークライ)

YouTube Clip - Pokémon Happy Set - March 2022 - Pokémon MEZASTAR

Source: https://www.youtube.com/watch?v=V4Z5wgYlgnc