system
Given the following post, respond as if you're commenting on Reddit:
human
[Pokemon] How does trainers distinguish Pokeballs

There are no name labels they just grab a random ball that just happen to be that one they need

plus aren't mot pokeball they have empty why don't just throw them at battlfeild?
gpt
It's probably an answer that depends on the person. If you take a look at the Gold & Silver protag, he has this weird attachment where he hangs them.

If we use recent installments, different balls can be used, so that's another identifier. Some manga showed off that the balls get numbered. The anime had one trainer use stickers. And most importantly, only champion level trainers really carry 6 balls. The average trainer you battle only has 2 to 4 on their person at a time, making much simpler to remember.