As our heroes travel on towards Rustboro City, they stumble into a forest filled with many different kinds of Pokémon. It turns out that the area is actually a Pokémon preserve, and it's looked after by a girl named Katrina. Katrina takes care of all of the Pokémon in the area and helps to nurse them back to health when they are sick. Max takes a particular liking to her Poochyena and he's determined to see it evolve before they leave the preserve. All of the Poochyena's companions who were born at the same time have already evolved, but this one Poochyena just doesn't seem ready. Max decides to coach the Pokémon and leads it out into the forest. Team Rocket has followed Max and they decide to play a trick on him to take the Poochyena. They claim to be researchers working on an evolution machine. Max is too smart too be fooled, but that doesn't stop Team Rocket from taking Poochyena. Luckily, Katrina and Ash show up just in time. This time Poochyena gets in on the action, too. That last battle turns out to be just what this little Poochyena needs – it evolves right before Max's eyes! (thetvdb.com)