I think with the showcasing of Farfetch’d in today’s episode and the Galarian form being shown in the preview that Go will get a Sirfetch’d. The Kantoian Slowpoke being shown makes me assume aspects of the DLC will be shown like Galarian Slowpoke.
That Sobble has me super interested and hopefully Ash gets that so I can finally care about one of his Pokémon. Now we wait for Grookey. Though if Leon has it/Rillaboom, he’ll follow a similar situation with the main character and him in the games where he has the starter with the advantage.
I don't know if Galarian Slowpoke will be shown in the episode Sonia shows up. Combining Slowpoke and Sonia, i think she will debut in Kanto to research Kantonian Slowpoke, which in turn leads to Gou and Ash going to Galar to research Galarian Slowpoke for Sakuragi (And in that episode, they can encounter the Farfetch'd as well for example and then Gou catches it, so Sakuragi can research both).