Bukamon

Bukamon '''is the In-Training form of Gomamon. His fresh form is Pichimon. He is partner of Joe Kido and Joe Kido's Son.'''

Digimon Adventure
Joe met his partner Bukamon when he first came to the Digital World and then Joe freaked out. Bukamon digivolved to Gomamon to protect Joe from Kuwagamon. After this, Gomamon only reverted to his In-Training form when degenerating from Zudomon.

Confession
Due to the reboot, Bukamon and the other DigiDestined Digimon are reverted to their In-Training forms with their memories erased.