I would like to suggest make this move like Magma Storm formula.
Why? Its very similar to Hail with this diffrence, Shock makes 6k DMG (6x 1k) and Hail 4.8k (3x 1.6k).
I think would be good to have ice move like this that hits once. Also the DMG could stay as it is.
And little off: Electrify makes DMG 5.2k, Magma Storm 6k. Increase a little DMG in Electrify to hit 5.5k~
Why? Its very similar to Hail with this diffrence, Shock makes 6k DMG (6x 1k) and Hail 4.8k (3x 1.6k).
I think would be good to have ice move like this that hits once. Also the DMG could stay as it is.
And little off: Electrify makes DMG 5.2k, Magma Storm 6k. Increase a little DMG in Electrify to hit 5.5k~