As long as that's what Brock wants XD. I can just imagine what's going to happen in a couple of years. Brock will fall in love with a Nurse Joy, and ask to live together. Whenever she's out, he would end up seeing a different one (thinking it was the same one). He'll probably tell each of them (again just thinking it is only one Joy) how much he loves them, and both will end up living with Brock. Then one day, the "couple" are at home, and the other Nurse Joy comes along. Brock will be surprised to see they are different and both Joys will think that Brock was cheating on them. Brock will never live a happy life XD!
On another note, there's only one episode left!? I've never really followed the anime, but the end seems to be pretty near! :O