I find it weird that on the Pokémon Unite data collecting sites(Serebii, Game8, Wiki) that the sites that lists Costume Party Clefable doesn't list Christmas Clefable and vice versa, they have Tea Party Clefable listed but they skipped over one of the Holiday Holowears, I wonder why?

Clefable has 6 Holowears in total, one is a Club exclusive (Costume), one is a Prize Ball exclusive (Christmas), and one is a Battle Pass exclusive (Tea Party), the other three are always available.