[Eventing Question] impossible to capture

would it be possible to create a map where you battle but can not capture pokemons? I want it to be impossible to capture independently of the ball

There's (at least) three obvious approaches:

1. Find the part of the code that's responsible for working out if your ball can catch the Pokémon, and make it always fail to catch if the player is on a particular map.
2. Find the part of the code that's responsible for checking which items you can use in battle, and make it report that balls are unusable on a particular map.
3. Find the part of the code that's responsible for checking if it's a trainer battle ("don't be a thief" or whatever it says), and add an additional check for a particular map.

Obviously you could check for a switch or whatever instead of the map ID.