I'll make it brief. Most OT Mat pokemon out there are legitimate. However, they're so common that they're practically worthless, as most of the time you can get them for free. If you honestly don't believe me, just take a look at Kaphotics. He's got a TON of stuff that runs around everywhere because of Pokecheck, becuase he's sharing thsoe pokemon with everyone.
They're legit, and they're OT Kurt, I believe. They're not hacked, they're just very common.
As for Max himself, he's not a scammer nor does he have reason to be. Thank you and good day.