Agumon is a Rookie-level Digimon that first appears as Tai's partner Digimon in the first Digimon season, Agumon eventually gains the ability to digivolve to his champion form of Greymon and then to his Ultimate form of MetalGreymon and then to his Mega form of WarGreymon.The next main Agumon appears in Digimon Data Squad as a main partner to Marcus, Marcus' Agumon eventually gains the ability to digivolve to his Champion form of GeoGreymon and then to his Ultimate form of RizeGreymon and then finally his Mega form of ShineGreymon.