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.

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

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.