I believe this was already discussed before (topic #15030), but just to be extra clear:
New games called Pokémon Sword and Shield (pokemon_swsh) were announced today (February 27, 2019).
The tags pokemon_swsh and pokemon_(game) should not be used for posts that are merely depicting new Pokémon from these games. (These tags are OK for human characters from these games.)
For example, post #3429705 is just Scorbunny and nothing else.
Basically, the reason (as discussed before) is that most certainly the exact same Pokémon will appear in the anime, manga, future games and such. Therefore a post with only a generation 8 Pokémon is not necessarily representative of the Pokémon Sword and Shield games.
For the same reason, we don't use the tag pokemon_rgby for every Squirtle, nor pokemon_gsc for every Totodile.
I'm only saying this because a few posts merely depicting gen 8 Pokémon were already being tagged pokemon_swsh and pokemon_(game), which I removed.