WaruSeadramon

WaruSeadramon is apparently the corrupted form of MegaSeadramon and it never appeared in the show, however, it appears in Digimon Card Battle.

Evolution

 * Fresh (Baby) - Botamon
 * Baby (In-Training) - Koromon
 * Child (Rookie) - ModokiBetamon
 * Adult (Champion) - Seadramon
 * Perfect (Ultimate) - WaruSeadramon
 * Ultimate (Mega) - ChaosSeadramon

Special Evolution

 * DNA Digivolution (Mega) - Zudomon + WaruSeadramon = Plesiomon

Attacks

 * Poison Wave
 * Dark Blast