Dolphmon

Dolphmon is a Champion Level Sea Animal Digimon, born of special signals within the software used in conversation research. Due to this, Dolphmon's way of thinking is extremely complex and is better at learning than normal humans. It does not like fighting so it only battles if it has no choice. Its Japanese name is Rukamon.

Evolution

 * Rookie - Penguinmon
 * Champion - Dolphmon
 * Ultimate - Whamon
 * Mega - Plesiomon

Special evolution

 * DNA Digivolution (Ultimate) - Octomon + Dolphmon = Scorpiomon
 * DNA Digivolution (Ultimate) - Dolphmon + Ikkakumon or Dolphmon + Leomon = Divermon

Attacks

 * Shaking Pulse (Pulse Blast): Fires a powerful sound wave from it mouth.
 * Dolphin Kick

Digimon 02
A bunch of Dolphmon helped Ikkakumon, MegaSeadramon, Cody and Submarimon protect a Destiny Stone under the sea from BlackWarGreymon. BlackWarGreymon used an attack to part the sea, sending the Digimon flying.

Digimon Tamers
Something that might be Dolphmon was among the shadowed Digimon that wanted Rika to tame one of them. A silhouette of one appeared on Henry's computer.

Digimon Frontier
Despite being in the opening theme (1st ending credits in Japan), the DigiDestined never encounter one. In the Opening theme, three Dolphmon were seen with Takuya, Neemon and Bokomon on their backs.