She was the Ranger of the forest and she helped all the weakened and injured wild Pokémon. She has three Mightyena and one Poochyena who guard the forest from poachers. After a lot of training with Max, Poochyena also evolved when it escaped, using Bite, from Team Rocket.
Katrina's Mightyena are used most to protect the forest from the Pokémon Hunters. One of them was newly evovled in ,AG011: A Bite to Remember, after it was trained by Max to start using Bite.