Looking at the English cameos thread, apparently not. There are a few with 8 Pokémon featured, but that Meowth promo with 10 is the most for the WotC era.
The card with the most Pokémon in a single artwork is the Japanese Art Academy Gourgeist, with 33 Pokémon in the artwork. The SM231 Champions Festival promo from 2019 is a close second with 29 featured Pokémon.
Greetz,
Quuador