BUT even with Pixelmon Extras sidemod, we cant reset players defeated Trainers or claimed Pokéloots.
I was told this data for a Player is not saved all in one file, but instead in the specific NPC/Loot. Which makes it hard to just get the data from 1 player out of all....
My Suggest is to save which NPC/loot a Player has in 1 file and/or let me reset ALL pixelmon mod related content from a player with 1 command.
Atleast the 1.16 version should have this.