Blizzaria in Yo-kai Watch 1

Blizzaria can be befriended by fusing Frostina with a Glacial Clip.

This item can be obtained post-game by defeating her and 2 Frostinas in the Request Snowy Accessory, given by Blizzaria herself in Hungry Pass in the Yo-kai World. After completing it, more of the same item can be found in Terror Time chests.

A Glacial Clip is also the reward for completing the "Snap Frostina!" Yo-kai Cam challenge.