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Without changing 5+ type matchups like everyone always wants to do
>Ice gets +50% defense boost in hail
>Ice type swift swim introduced, other abilities exclusive to ice types as well, like Big Pecks is to flying types
>Icy Wind boosts the speed of all ice types as a move property now, increasing ice type prominence in doubles to punish spread move spam and making them put work in singles against things that use Icy Wind over HP Ice, like Keldeo
>Wider distribution on Freeze Dry and Icicle Crash
>Silly shit: STAB Ice Beam now ignores defense and evasion modifiers (If you want, give the buff to STAB Thunderbolt and Flamethrower too because fire/electric types could use some help