A new Pokémon has supposedly been revealed on the Sword & Shield website - however, it appears as a pixelated image:
Unknown glitch Pokemon (click for animated version)
The Pokémon is listed as Fighting type with the ability Steadfast.
The URL segment, which normally has the Pokémon name in it, shows as zbpkxr1gw8, and the image filename is pq2ot9z9fh.gif. We'll bring more information as we get it.