The book

Ash sat down on a chair in the lab and started to read.
"... found out, that once inside the Omniball.3 the captured individual is no longer of human species. The DNA itself is being changed to something resembling a hybrid form of human and pokemon." Ash was once again confused, but before asking the Professor for an explanation he decided to read on. Maybe it would be explained in his writing by itself.
"We have tho improved the Omniball since compared to its further version 2, it now does not destroy the brain of the captured pokehuman. The pokehuman keeps intact considering the mind and abilitys he or she had before. Also his or her feelings are untouched, beside the desired raise in obedience and loyalty which is commonly known to experts as..." Ash read along the page but the rest was a lot of stuff he didn't quite understand. What he got out of the first page was, that his mom now was no longer a human but something between pokemon and human. A pocket human. Pokehuman.