Some Trainers actually physically mark their Poké Balls. (I recall a Trainer from the anime doing this, I just can't remember who…)

Can't see the original post well, sry. What did it say verbatim?

… That exists. Alex is a real user.

What's with the random Z piece?

I only wanted to point something out. And I deliberately linked a source. But still, I'll admit that I was wrong.