A checkbox without the need for a game to be linked.

Hello! I play a lot of unofficial Pokémon games like Cobblemon and would love to see a feature where I can track from a national pokedex and simply mark off each Pokémon like a checklist, like take the national classic style for example, but I can click on their picture and grey them our, mark as complete, or mark as a goal. Thank you for your time and for such a wonderful resource!