As I was writing for my story, a thought passed my mind about Poke balls; couldn't they carry non-Pokemon objects?
One of the memories I have of the early anime is when Ash is trying to capture a Mankey and ends up catching food instead. Now, I know that a lot of the anime is not considered canon for writing, but this is one of those things that would never pop up in gameplay, so we wouldn't really know either way.
In the end I decided against it, as the mechanic itself would outweigh the note sent inside the ball in the mind of the reader, I expect. But does this seem viable to anyone else?