come to think of it, the only Pokémon fan content I ever made was ROMhacks and other fangames, and I don't remember ever publishing anything I made (because I never finished my projects)

my main interaction with the community would have been playing the card game at local stores, and maybe using fan forums a bit but I don't remember if I ever did

so maybe I should say Minecraft. I was very active on the old Minecraft Forum and made several failed attempts at mapping.