Freeze is a status condition that a Pokémon can suffer in battle. While frozen, the Pokémon is virtually defenseless as it can't attack. A Pokémon can dethaw by getting hit with a Fire attack, by use of an item (Ice Heal and Aspear Berry are the specific freeze healing items), or by use of certain Fire moves in battle. Ice type Pokémon and Pokémon with the Magma Armor abillity are the only ones immune to this status condition. Additionally, a Pokémon cannot become frozen if the move Sunny Day is in effect; however an Ice-Type Pokémon can still become frozen if hit with the move Tri Attack.
Moves that Defrost Frozen Pokémon (user)
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