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From Serebii
>It has been announced that a special Bewear distribution will run in Pokémon Centers across Japan to tie in with the Sparkling Spring Festival campaign. During this, from April 15th to May 7th you will be able to obtain a Bewear. Currently no details are known about the Bewear but we'll bring more as it comes.
I'm guessing this is because of Bewear's role in the anime