Pretty much no one - unless you count the "research" whaling that's still being done by Japan etc.
The reason being that there's no permanent population in the Antarctic, only temporary researchers, scientists and the occasional adventurers. And they're generally too busy, and too ethical to do any poaching.
Usually people who need the meat, or people who need the money they can get from selling the poached animals. Or sometimes for the thrill of it.
Bears are Antarctic animals.
Antarctic
No animals live on the Antarctic continent. Some animals, such as penguins, come to the Antarctic beaches to breed.
No animals live permanently on the Antarctic continent or in its polar ice cap.
No animals live on the Antarctic continent.
There are no mountain lions or any other animals found in the Antarctic. It's too cold on the Antarctic continent for land-based animals to survive in the wild.
There are no plants or animals that live in Antarctica, except for a few hardy grasses, which can grow in the warmer summer months, especially on the Antarctic peninsula. For animals that live in the Antarctic regions, see the related question. Note that no animals live on the Antarctic continent.
Any animal you find on the Antarctic continent visits its beaches to breed. Otherwise, no animals exist on the Antarctic continent.
There are no native animals on the Antarctic continent.
the Arctic
Yes.