Do people ignore the hints throughout DP? Doc Brock? His need to heal Pokemon? Overjoyed in Battle Frontier where he commandeered a Pokemon center? There's more. It's not sudden. He's been nursing Pokemon for the last several years.Why now? Obviously because DP is ending. It wasn't all of a sudden at all. It's the end of the saga, it's time to send characters off, and 90% fandom predicted this long ago.