Digimon Tamers (2001)

S1E3 To Fight or Not to Fight

Henry and Terriermon intervene to break up the clash between Guilmon and Renamon, while Takato discovers an ideal spot for Guilmon to hide during his absence. As Guilmon and Renamon continue their battle, Terriermon steps in front of an incoming attack. He digivolves into Gargomon, but struggles to manage his newfound strength, nearly harming Rika in the process. Fortunately, Guilmon arrives just in time to protect her.