This is a series 7 BSS competition with ONE normally banned Pokémon allowed. Similar to the Battle of Legends recently, except singles instead of doubles.
RULES (https://battle.pokemon-home.com/regulation/000000107/en)
Bring 6, pick 3. Singles
All Pokémon become level 50 in battle
Item clause
All Pokémon available in Sword and Shield, the DLCs, and Pokémon Bank transfer allowed EXCEPT:
Mew, Celebi, Jirachi, Victini, Keldeo, Genesect, Diancie, Volcanion, Magearna, Marshadow, Zeraora, Meltan, Melmetal, Zarude
Each team limited to ONE of the following:
Mewtwo, Lugia, Ho-oh, Groudon, Kyogre, Rayquaza, Palkia, Dialga, Giratina, Zekrom, Reshiram, Xerneas, Kyurem, Yveltal, Zygarde, Cosmog, Cosmoem, Solgaleo, Lunala, Zacian, Zamazenta, Calyrex
Not entirely sure what it has to do with dragons, but there you go.
