Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
No! If your catgirl has human ears it is very likely that she is actually a human who is cosplaying as a catgirl. The term "four-ears" is viewed as a very rude insult against catgirls, so please be thoughtful and avoid the topic around them.