Pretty sure that's not a hack. Fathers can pass down the Pokeballs they were caught in to their children, and Beast Balls can be used on any Pokemon-- not just Ultra Beasts.
I don't think that's what Freohr was implying. In this case, it's bad. Generally? No, but you should do it in the proper place or, at the very least, start the thread off properly with the intention of wanting to discuss said controversial thing.