Within in the August Reveal Trailer for Pokemon Sword & Shield, the Pokemon Company introduced what are known as Galarian Forms. As the name might suggest, Galarian Forms are just like Alolan Forms. Galarian Forms will be given to a number of older Pokemon, and these forms usually see a difference for these older Pokemon where their appearances, typings and Abilities are concerned.
The first Pokemon revealed to have a Galarian Form include Zigzagoon, Linoone and Weezing. Galarian Weezing will be a Poison/Fairy Type Pokemon, now purifying the air around it instead of causing more harm to it. Galarian Zigzagoon and Linoone will each be Dark/Normal Type Pokemon, and, believe it or not, they will have an additional Pokemon added to their Evolution Chain (but only through their Galarian Form Evolution Chain).