I don't think this is Brock's good-bye...yet.
I mean, let's think about this. The hyper-active Nurse Joy showed more interest in May's accomplishments than Brock's existance. After setting up that the incredibly hott Azami actually have a crush on him [in a cruel twist of fate I might add], it only seems...decent that he ends up with her. After years and years of oggling thousand, even millions of girls, he bags a hottie. Forget breeding, "gettin' some" was his goal on the show.
On to the episode, how convenient that Nurse Joy just happens to fall ill. Hmmm...I bet there's nothing all those Chansey floating about can do. You know, those fat, healing egg things? The ones that can use the likes of Refresh, Softboiled, Heal Bell and Aromatherapy?
MIGHTY convenient...