...No hold on, this is fishy.
First of all, it's not only shiny, but its naturally flawless across the board with an Adamant nature. While that is possible, it's still really rare.
Secondly, it was hatched on the day Sword and Shield was released. So that means that whoever this is, they hatched a Perfect Shiny on day 1.
And while not as big as a deal, it is in a regular PokeBall, which means its parent was in a regular PokeBall, and catching even Dreepy in a regular PokeBall is... questionable. Not just because of difficulty, but at that point in the game, you have access to a far wider variety of PokeBalls.
Hmm... I'm gonna see if this thing has any background, like that Shiny Porygon Z outbreak in BW days.