Pokemon Best Wishes! - episode 77 - 02 May, 2012

Stopping at Abtilbe Town's Battle Club, Ash meets his Tepig's former trainer, Shamus, who abandoned Tepig because he felt he was too weak. Angry, Ash challenges Shamus to a double battle with Snivy and Tepig going up against Shamus's Emboar and Heatmor, during which Snivy takes a hit to save Tepig, which motivates him to evolve into Pignite. (Source: Wikipedia)