Agumon is a Legacy Digimon only heard from in legends in the Digital World. In alternate universes it is quite common, but in this version of the Digital World it is more of a rare sight. Most of the times you'll see Slomon in most cases, but out of every 100 Slomon in the area an Agumon is sure to be hiding somewhere. The redesign is too match with the modified graphical style Bronze and Cobalt would use, with other theropod based Digimon getting a similar redesign.
Digimon Bronze and Cobalt Versions
Agumon is a Balance type Digimon specializing in the Fire element. Agumon can only be obtained after beating the game the first time, with it's older designs from Digimon Adventure and Digimon Data Squad being hidden unlockables in the game in special locations based on locations in their respective anime seasons. Agumon is also one of the requirements to face Examon, with Veemon, Guilmon, and Dorumon being the other requirements.
It digivolves from Koromon at Level 7 and digivolves into Greymon at Level 17 or GeoGreymon with 160 Attack.