What gods and goddesses were Artemis's enemies?

Kind of. Some stories make it seem like they are friends (they are both strong virgin goddesses), but some make it seem like they are competitive with each other. It's varied whether Athena or Artemis is Zeus's favorite daughter (most of the time it is Athena) and if Artemis or Athena is the strongest goddess (most of the time it is Artemis). Since they are a little similar, it would make sense that they would each try to be the better of the two.