Wrong Side of the Tracks - S2-E19
Trivia: The reason why Harley is played by a different actor for this episode, and then subsequently written out of the show and replaced by Griff, is because Danny McNulty, in his own words, suffered a bipolar meltdown during the table read and ended up checking into a mental health facility for around a month. He said it ended up largely derailing his acting career until he returned to play Harley again in Girl Meets World.