Kyurem

Overview
Kyurem is one of the main bosses of Pokemon Mystery Dungeon: Gates to Infinity, he appears in the ice castle and prevents you and your partner from changing time and defeating Bittercold, so you need to beat him. He is also the antagonist of the game, he is the one to deystroy Hydriegon's (a.k.a. the voice of life) physical form.

Statistics
Kyurem's level s unknown but he is around level 40-50, his known moves are Slash and Glaciate.