FA Venusaur (Primordial Arts, SWSH#100) - Mainland China only RR Venusaur (Primordial Arts, SWSH#102) - Mainland China only Koko (Koko ticket giveaway) Charizard (Pokémon Center booster pack purchase)
Ponyta (Gym Promo series 12, SIT#021) FA Blastoise (Primordial Arts, SWSH#101) - Mainland China only RR Blastoise (Primordial Arts, SWSH#103) - Mainland China only Quagsire (Gym Promo series 12)
Milotic (Pokémon Center Kanazawa Open Commemoration Special Box, DAA#039)
Piplup (Pokémon Center purchase campaign)
Sobble (Pokémon Center Kanazawa Open Commemoration Special Box, SSH#054)
Cramorant (Pokémon Stamp Box) Pikachu (Pokémon Center/PUBLIC TOKYO purchase campaign)
Pikachu (Pokémon Stamp Box)
Detective Pikachu (Detective Pikachu broadcast commemoration campaign)
Kanazawa's Pikachu (Pokémon Center Kanazawa Open Commemoration Special Box)
Rescue Team DX's Pikachu (Geo Pokémon Mystery Dungeon: Rescue Team DX purchase campaign)
Shibuya's Pikachu (Pokémon Center Shibuya Opening)
Swallowed Up Pikachu (Forest of Okoya Celebi & Zarude Special Advance Ticket 7-Eleven Set)
Mischievous Pichu (P-Lab. Project merchandise campaign) Duosion (Gym Promo series 12, SIT#077) RR Lucario (Lucario HR Competition, SWSH#214)
Pancham (Gym Promo series 12, CRZ#072) Galarian Meowth (Gym Promo series 12, CRZ#084) Aerodactyl (Gym Promo series 12)
Lugia (Find the Legendary Pokémon! Lugia Get Challenge, SIT#139)
Hisuian Braviary (CoroCoro Ichiban! issue insert - October 2022) Marnie (Extra Battle Day 2022, SSH#169)
Plump Musician (Koko Theme Song Collection Limited Edition insert) Raihan (Extra Battle Day 2024, EVS#152)
Celebration Fanfare (2020-2021 season Championship Point reward)
Celebration Fanfare (2021-2022 season Championship Point reward) Peaceful Park (Gym Promo series 12)
Player's Ceremony (2019-2020 season Championship Point reward)
SWSH is probably the era with the smallest amount of cards exclusive to Japan so that's one good thing about it at least.
The unreleased S-P Promos are pretty much the bulk of it. Cynthia 155/S-P, Mallow and Lana 256/S-P, and the unnumbered Pokelun TV's Pikachu and Friends are the ones I see missing. Do you include the Player's Ceremonies and Celebration Fanfares?
There's also the Chinese-exclusive Venusaur and Blastoise V full arts and rainbow Venusaur and Blastoise VMAX cards from CS3bC.