1) To train and to catch Pokemon; the combined action of leveling up and teaching new moves to Pokemon and catching new ones in preparation for a Poke Battle.
Etymology: From the combined words "train" and "catch" this word was originally used to describe the actions of high school students who played Pokemon during class time after AP exams.
Person 1: "Dude, what are you doing in class after APs?"
Person 2: "Dog, I'm gonna be straight tratchin'."
Person 1: "Man, what are doing with your spare time?"
Person 2: "I'm tratchin' in preparation for the big tournament."