Koromon

Koromon is a In-Training level Digimon, its name came from the onomatopoeia for something round and rolling (ころころ  Korokoro) and mon short for monster. Being a In-Training Digimon it's very weak and can't fight well at all. In most cases it digivolves from Botamon and digivolves to Agumon.

Digimon World DS
Koromon can digivolve into Agumon if Level 6+, ToyAgumon  if Level 7+ and Machine EXP 30+, or DotAgumon if Level 20+ and need to have already befriended DotAgumon. It is a Starter Digimon, that can also be found in Data Forest if chosen as the starter, it will have Balance attack-type and obedient personality.

Digimon World Dawn & Dusk
Koromon is #002 in Digimon World Dawn and Dusk, and is a Balance-class Dragon species Digimon with a resistance to the Fire element and a weakness to the Earth element. Its basic stats are 66 HP, 67 MP, 47 Attack, 35 Defense, 27 Spirit, 28 Speed, and 11 Aptitude. It possesses the Powerful 1 trait. It dwells in the Limit Valley.

Digimon World Championship
Koromon can digivolve from Nyokimon, Mokumon  or Yuramon  with 20 Dragon AP or Botamon by passing time, and it will digivolve to Agumon with at least 3 battles, SnowAgumon  with 20 Aquatic AP, BlackAgumon with 20 Dark AP, Veemon  with 20 Dragon AP and at least 3 battles, or ToyAgumon  by passing time.