1x35 - Digimon Tamers

With the unfortunate help of Dark Digivolution, Guilmon digivolves into Megidramon. Megidramon battles Beelzemon and almost has him killed by consuming the demon, but Makuramon comes to confront Beelzemon on how useless his digivolution was. Beelzemon kills Makuramon and breaks free. He kicks Megidramon at his weak point, the chest, defeating him. Megidramon dedigivolves back to Guilmon. Takato goes through deep sorrow and reaffirms his friendship with his Digimon. After making a wish that he could fight, Takato and Guilmon Biomerge to become Gallantmon.