"There are always bad things that happen," Rex said. "Accidents... crimes... bad people. Like Team Rocket. They made a lot of trouble in Kanto and Johto. They stole Pokémon, and hurt people. They experimented on Pokémon, and even made one, if the rumors are to be believed." He sighed.
"Let me tell you a story as we walk," Rex continued. "When I was little, my grandfather gave me an Eevee he'd caught on a trip. We were best friends. But when he evolved to Espeon, he became a target. Someone took him. And when the police found him... he didn't even recognize me. He saw me and attacked. They had no choice... they had to put Thom down. It was the worst thing that ever happened to me.
"That's why I want to be a better, stronger Trainer," he finished. "I want to make sure that what happened to Thom and me doesn't happen to anyone else."