Police in Japan have arrested a 36-year-old man on suspicion of selling illegally modified Pokémon save data to customers online — a practice which is banned under the country’s 2019 Unfair Competition Prevention Act.
I'm thinking he was probably selling saves with all the Pokémon plus all the Pokémon in shiny and a complete story. I did this with every single Pokémon game prior to switch and put them all on my Pokémon home when they were discontinuing pokebank, but only the ones that are able to be caught legit that way.