Random when using Defend against Iolan in one-player battle.
Beat Devil once in the battle arena. Formally the DEVIL avi renamed on April 29th 2007.
Dress your pet in an insideout costume
Use an ice cossie on your pet
Beat Ice nome 50 times in the battledome
Complete Blitzen Mission 27. 
Buy any item from the Frozen Food shop.
Attach a dna minipet to your pet and let it watch tv in your marahome until it is 100% happy.
View the profile of the pet named Invisible
Random when using Defend against Iolan in one-player battle.