Agumon is the main Digimon of Pikaro Ampoz. Among the other Digimon partners in the series, Agumon spent the longest time with his partner. Due to some changes to his data by Pikaro, Agumon possesses unique abilities other Agumon do not such as multiple Digivolution lines and programs that make him highly adaptable.
Agumon gets along with Pikaro like they were brothers. Pikaro met Agumon on his first trip to the Earth Digital World. He has a similar appearance to a Digimon Pikaro befriended on his homeworld's digital world. Agumon had gone through a lot of training with Pikaro to the extant that he can damage an Ultimate or Mega level.