Hugh first appeared in B2W2-001]] when Team Plasma stole his sisters Purrloin. He wanted to battle against Lexi after hearing about her history. He decided from that point on, that he would take on the Gym's of Unova so he and his Pokémon can take on Team Plasma.
He returns in B2W2-020 when he boards the Plasma Ship and Lexi goes after him, knowing he'll be unmatched. He appeared several times following this whenever Team Plasma had been sighted. When Team Plasma was taken down, he saved his sisters Purrloin - feeling freed from the burden, he decided to venture elsewhere in order to live his life properly.