Ikkakumon

From the Digimon series, Ikkakumon is the Digivolved form of Gomamon. He is a large, walrus-like creature with a horn on his head.

Evolution

 * Baby - Pitimon
 * In-Training - Bukamon
 * Rookie - Gomamon
 * Champion - Ikkakumon
 * Ultimate - Zudomon
 * Mega - Plesiomon/Vikemon

Special Evolution

 * DNA Digivolution (Ultimate) - Gesomon + Ikkakumon = Scorpiomon

Abilities
His fur can withstand the coldest of lands. When he's not moving, his giant body is like a white gun platform.

Attacks

 * Harpoon Vulcan (Harpoon Torpedo): The horn on his head can shoot many times in a row.
 * Heat Top: His horn becomes very hot and he strikes opponents with it.
 * Horn Attack: Thrusts his horn upwards.
 * Icicle Coat: Covers everyone in about a metre radius with ice.

First Season (Digimon Adventure)
Gomamon first Digivolved to Ikkakumon to protect Joe from the Black-Gear-infected Unimon. Since then, Ikkakumon has been fighting various enemies like Devimon, Etemon & the henchmen of Myotismon.

But on August 3rd, Joe & T.K. tried to get back in Odaiba on Ikkakumon. However, they got ambushed by MegaSeadramon while they were passing Rainbow Bridge. Joe reliably saving T.K. from drowning gave Ikkakumon the ability to Digivolve to Zudomon, who defeated MegaSeadramon. Afterwards, in most battles, Ikkakumon would only appear briefly just before he would Digivolve to Zudomon.

Other than being used for battle, Ikkakumon was also used as a ferry for travelling across the water.

Second Season (Digimon Adventure 02)
One year after their adventure, Joe & Gomamon were reunited and Joe gave up his Crest power to free the Sovereigns. As a result, Gomamon lost the power to become Zudomon. Two years later, when the Digimon Emperor was conquering the Digital World, Gomamon was among the old generation Digimon to help the new gang out, appearing four times as Ikkakumon.

V-Tamer
Gon the Gomamon Digivolved to Ikkakumon after being appointed the new Net Ocean Protector by Lord Whamon.