hi! questions such as this don't really warrant their own thread, and should be directed to either the
Q&A thread or
NP (metagame) thread. However, if this is a more VGC focused question, you might wanna use
their Q&A thread instead to get a more accurate answer. To answer your question to the best of my extent though, the combination of Hospitality+Rage Powder can be very alluring on a support Pokemon, so that's most likely why its as popular as it is.