Koromon

Koromon are pink, ball-shaped Digimon with floppy ears, bright-red eyes and sharp teeth. They are approximately a foot tall. The name "Koromon" derives from the Japanese word "korokoro", meaning "something small, round, and rolling".

Digimon Adventure
In the Digimon Adventure anime Koromon is the In-Training form of Agumon, one of the series' main characters. Koromon also appears in Primary Village, when a Botamon digivolves.

Digimon Frontier
A Koromon was seen at the Autumn Leaf Fair. Another one was at the Village of New Beginnings run by Swanmon.

Digimon Savers
Koromon is the In-Training form of an Agumon who is the main character from Digimon Savers.

Digimon Next
GeoGreymon regresses to Koromon during a battle with Zanbamon.

Digimon Adventure V-Tamer 01
In Star City, a Koromon was among the digimon that wanted to shake Taichi Yagami and Zeromaru's hands.

Digimon Virtual Pet
Koromon appears in two Digimon virtual pet toys - the original Digimon v-pet and the Digimon Mini

Digimon World
Koromon can digivolve into Agumon. It digivolves from Botamon, which hatches from the spotted green egg.

Digimon World DS
Koromon can digivolve into Agumon, ToyAgumon or DotAgumon. It is a "Starter Digimon", that can also be found in Data Forest if chosen as the starter.

Digimon World Dawn/Dusk
Digivolves to Agumon at lv 7 and digivolves to DotAgumon at lv 30, MinAPT 45, and if you already own a DotAgumon.

Attacks
 * Bubble Blow (Acid Bubbles): Fires bubbles from its mouth.