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A move like Thunder Wave, Toxic etc but Freeze. It won't be too broken since its somewhat similar to Sleep and fire moves can thaw the user. Only give it to Ice types or Pokemon that have associations with the cold.
Create a move like Rest which heals 60% HP and Freezes the user for one turn, Sleep Talk wouldn't work, but it could raise your defenses for that turn, and Fire type moves or Scald could still thaw the user.
Increase DEF by 50% in Hail. Also make Water types take no damage from it, making them good teammates to Ice types. Add more moves that play off Hail like Solar Beam or Thunder do for their weather.
Make it resist Water, Electric and Ground, and remove its Steel weakness.
>for no reason
There is a reason, both "rock-paper-scissors" logic and balance check out. Water and Ground types need to be taken down a notch, Steel is now SE against Fairy so that's fine and electric having one weakness is bullshit anyway.
Sorry if I made mistakes. It's late for me and it's hard to think ATM.