The official Pokémon website has announced the Tiny Tourney for Pokémon Sword and Pokémon Shield. Our 8th Generation Online Competitions page has been updated with these details.

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Tiny Tourney

Information
Region: International
Registration Period: Wednesday, November 24, 2021, at 9:00 p.m. PST until Thursday, December 9, 2021, at 3:59 p.m. PST.
Tournament Period: Thursday, December 9, 2021, at 4:00 p.m. PST until Sunday, December 12, 2021, at 3:59 p.m. PST.
Ranking Results Announcement: December 2021
Compatible Games: Pokémon Sword and Pokémon Shield
Eligible Pokémon: Bulbasaur, Charmander, Squirtle, Caterpie, Sandshrew, Nidoran♀, Nidoran♂, Vulpix, Zubat, Oddish, Diglett, Meowth, Psyduck, Growlithe, Poliwag, Abra, Machop, Tentacool, Ponyta, Magnemite, Farfetch'd (Galarian Form), Shellder, Krabby, Exeggcute, Cubone, Koffing, Rhyhorn, Tangela, Horsea, Goldeen, Staryu, Magikarp, Eevee, Porygon, Omanyte, Kabuto, Hoothoot, Chinchou, Pichu, Cleffa, Igglybuff, Togepi, Natu, Wooper, Sneasel, Swinub, Corsola (Galarian Form), Remoraid, Tyrogue, Smoochum, Elekid, Magby, Larvitar, Treecko, Torchic, Mudkip, Zigzagoon, Lotad, Seedot, Wingull, Ralts, Nincada, Whismur, Azurill, Aron, Electrike, Carvanha, Trapinch, Swablu, Barboach, Corphish, Baltoy, Lileep, Anorith, Feebas, Duskull, Wynaut, Snorunt, Spheal, Bagon, Beldum, Shinx, Budew, Combee, Cherubi, Shellos, Drifloon, Buneary, Stunky, Bronzor, Bonsly, Mime Jr., Happiny, Gible, Munchlax, Riolu, Hippopotas, Skorupi, Croagunk, Mantyke, Snover, Lillipup, Purrloin, Munna, Pidove, Roggenrola, Woobat, Drilbur, Timburr, Tympole, Venipede, Cottonee, Petilil, Sandile, Darumaka, Dwebble, Scraggy, Yamask, Tirtouga, Archen, Trubbish, Zorua, Minccino, Gothita, Solosis, Vanillite, Karrablast, Foongus, Joltik, Ferroseed, Klink, Elgyem, Litwick, Axew, Cubchoo, Shelmet, Mienfoo, Golett, Pawniard, Rufflet, Vullaby, Deino, Bunnelby, Fletchling, Pancham, Espurr, Honedge, Spritzee, Swirlix, Inkay, Binacle, Skrelp, Clauncher, Helioptile, Tyrunt, Goomy, Phantump, Pumpkaboo, Bergmite, Noibat, Rowlet, Litten, Popplio, Grubbin, Cutiefly, Rockruff, Mareanie, Mudbray, Dewpider, Fomantis, Morelull, Salandit, Stufful, Bounsweet, Wimpod, Sandygast, Jangmo-o, Poipole, Grookey, Scorbunny, Sobble, Skwovet, Rookidee, Blipbug, Nickit, Gossifleur, Wooloo, Chewtle, Yamper, Rolycoly, Applin, Arrokuda, Toxel, Sizzlipede, Clobbopus, Sinistea, Hatenna, Impidimp, Milcery, Snom, Dreepy, and Kubfu are eligible. Each Pokémon in your Battle Team must have the Galar symbol or battle-ready symbol.
Battle Type: Double Battles
Entry Gift: By taking part in this Gym Challenge, you'll earn a participation gift of 50 Battle Points.
Description
Trainers have until 3:59 p.m. PST on December 9, 2021, to register for the latest iteration of the Tiny Tourney Online Competition in Pokémon Sword and Pokémon Shield. During this event, petite Pokémon get a chance to show off their skills—your Battle Team can only contain Pokémon three feet, three inches tall or smaller that have not evolved but are able to. This competition is comprised of Double Battles, and qualified participants will earn 50 Battle Points. Are you ready to go big with small Pokémon? Sign up for the Tiny Tourney and find out!

Source: https://www.pokemon.com/us/pokemon-news/sign-up-for-the-tiny-tourney-online-competition/