Personally, I'm in favor of killing Stalkers as we find them. It's best to avoid bloodshed when we can, but first off we don't know if any or all of the Stalkers are innocent beings possessed by evil, or if Mille is just an oddball. And frankly... Mille asked us to kill her, she's killed other Pokémon, and she seems to be suffering. We don't have to clear her off the board immediately, but...

Do we want to take a vote on this? It might help.