Kyurem

Boundary Pokémon (Legendary) ^#646

Dwelling within it is a power even greater than that of Reshiram or Zekrom, but the extreme cold keeps that power bound.

It appears that this Pokémon uses its powers over ice to freeze its own body in order to stabilize its cellular structure.

- Pressure
  Moves targetting this Pokémon use one extra PP. This ability stacks if multiple targets have it. This ability still affects moves that fail or miss. This ability does not affect ally moves that target either the entire field or just its side, nor this Pokémon's self-targetted moves; it does, however, affect single-targetted ally moves aimed at this Pokémon, ally moves that target all other Pokémon, and opponents' moves that target the entire field. If this ability raises a move's PP cost above its remaining PP, it will use all remaining PP. When this Pokémon enters battle, all participating trainers are notified that it has this ability. Overworld: If the lead Pokémon has this ability, higher-levelled Pokémon have their encounter rate increased.

It generates a powerful, freezing energy inside
itself, but its body became frozen when the energy
leaked out.