Ikkakumon

Ikkakumon is a Sea Animal Digimon whose name is derived from the Ikkaku (一角) and whose design is derived from the narwhal, the, and the. It is a sea animal Digimon that was discovered in the computer of an Arctic exploration base. Its thick fur and stout body are structured so that it can endure even freezing lands. Its sharp horn is made of "Mithril", one of the rare metals, and the skin under its fur is just as hard. The portions of its soles where its claws attach are heat tops that are able to give off high temperatures at will. As such, it's able to maintain a tight footing when on ice, but it isn't able to move very nimbly. When in battle, it will intimidate the opponent with an impressive roar similar to a lion's.

Digimon Tamers
An Ikkakumon is one of the shadowed Digimon who wanted Rika to tame him as a Partner.

Digimon Data Squad
Ten years before the events of the series, a Gomamon emerged from the water and digivolved into Ikkakumon where it attacked Spencer Damon's group (it had become enraged after Akihiro Kurata shot at one of the Digimon).

Digimon World 2
Ikkakumon digivolves from Gomamon and Penguinmon, and can digivolve to Whamon or Zudomon(DP6+).

Digimon World 3
Ikkakumon is only available as a Blue Champion Card with 13/13.

Digimon Digital Card Battle
The Ikkakumon card is #047 and is a Champion level Ice-type card with 1200 HP, needing 40 DP to digivolve into, and worth 20 DP in the DP Slot. Its attacks are: Its support effect is "If opponent's Specialty is Fire, own Attack Power is tripled."
 * "Harpoon Torpedo": inflicts 340 damage.
 * "Heat Top": inflicts 250 damage.
 * "Northern Light": inflicts 200 damage, or X3 damage against fIRE-type opponents.

He also appears in session two in Igloo City.

Digimon World DS
Ikkakumon digivolves from Gomamon at LV 22, and can digivolve to Zudomon. Ikkakumon also appears in Drain Tunnel.

Digimon World Dawn and Dusk
Ikkakumon is #134, and is a Champion-level, HPtype-class, Aquan-species Digimon with a resistance to the Water element and weakness to the Steel element. Its basic stats are 170 HP, 162 MP, 110 Attack, 96 Defense, 93 Spirit, 68 Speed, and 35 Aptitude. It possesses the Protect 3 and Mist Cape3 traits.

Ikkakumon digivolves from Gomamon and can digivolve to Zudomon. In order to digivolve or degenerate to Ikkakumon, your Digimon must be at least level 21, with 70% friendship.

Digimon Story: Lost Evolution
Ikkakumon is #097, and is a Champion-level, HP-type, Beast-species Digimon with a resistance to the Earth and Water elements and a weakness to the Fire element. It possesses the Sleep Guard and High Sniper traits, and has the special skill Dive.

It dwells in the Palette Amazon. When defeated, it can drop the Spirit of Ice, or the debug plate for Zudomon.

Ikkakumon digivolves from Gomamon, and can digivolve into Zudomon. In order to digivolve or degenerate into Ikkakumon, your Digimon must be at least level 17 with 70 defense and 50% friendship.

Digimon Masters
Ikkakumon can be ridden.

Attacks
 * Harpoon Torpedo (Harpoon Vulcan): Shoots its regrowable horn.