Over the past few days, Pokemon Sword and Shield has been subject to a number of leaks that recently revealed Zacian and Zamazenta's two forms as well as their types. Zacian is, surprisingly, a pure Fairy-type in its base form, whereas Zamazenta is a pure Fighting type. After absorbing metal, each legendary can go into a second form (the form that has been showcased in previous footage) and obtain a secondary steel typing. While no official word from Game Freak has ever revealed this, it seems that the developer was actually teasing the legendaries' types.
This teasing has been done through the reveals of each games' exclusive Galarian form Pokemons confirmed so far. Some time back, the Pokemon Sword and Shield developer pulled the curtain back on Sirfetch'd, the evolution of Galarian Farfetch'd, and revealed that it was a Fighting type exclusive to Pokemon Sword after teasing it through cryptic images. Pokemon Shield's exclusive, on the other hand, was a little more elusive.
During a 24-hour live stream, Game Freak revealed Galarian Ponyta who many thought would be a Fairy type based on its design and the fact the area displayed show a ton of Fairy types. It turned out to be Psychic, but this just shifted many to thinking that Galarian Rapidash would be Psychic/Fairy, and according to these leaks, that is exactly the case. Therefore, Game Freak has revealed information about each game's exclusive Pokemon that perfectly correspond with the type of the other game, with each done so in an elaborate way to draw attention.
To be clear, Pokemon Sword's legendary Zacian is a pure Fairy type in its base form, but its exclusive Sirfetch'd is a Fighting-type. In contrast, Pokemon Shield's legendary Zamazenta is a pure Fighting type in its base form, but its exclusive Galarian Rapidash has Fairy typing. Each game's exclusive Galarian form/evolution lines up with the type of the other game's legendary, but it seems no one ever stopped to think why these Pokemon, of all the various forms, were chosen to be exclusive.
This seems intentional of Game Freak's part and is a nice touch to add some well-rounded Pokemon to each game. After all, this gen seems like it'll be tougher to get a well-balanced team, as every Pokemon Sword and Shield starter evolution has a pure Fire-, Water, or Grass-type and the Pokedex is considerably smaller than past generations. Only time will tell how the competitive scene turns out considering this.
Pokemon Sword and Shield release November 15, exclusively for the Nintendo Switch.