Even if it loses Refrigerate STAB Hyper Voice, Auto-hit Blizzard still technically hits harder, so that's not an issue. Not to mention it already has good coverage with Earth Power and Thunderbolt. It'll be interesting to see what Amaura does, actually. It's already a decent Scarfer, and the ability to negate sun (which is apparently an issue) is actually going to be a big bonus.
Technically, Hyper Voice does hit harder, although in most cases (where it's not already an OHKO either way) they have completely identical damage.
Against Fletchling, for example, it's easier to see.
220+ SpA Refrigerate Amaura Hyper Voice vs. 156 HP / 52 SpD Fletchling: 38-48 (165.2 - 208.6%) -- guaranteed OHKO
220+ SpA Amaura Blizzard vs. 156 HP / 52 SpD Fletchling: 36-44 (156.5 - 191.3%) -- guaranteed OHKO
This is because of an oddity in the damage calculation formula, which is such:
[(2*Level+10)/250*(Attack/Defense)*Base Power+2]*Modifier
The first two terms inside the brackets are unimportant, as they don't vary. The base power, however, does, as does the multiplier.
Because the modifier is outside the brackets, it also multiplies the +2, which does give a slight advantage to modifiers. This is compounded by the issue that 1.3*90 is 117, as opposed to Blizzard's 110.
This is similar to how Murkrow's Hidden Power Grass could 2HKO chinchou while Dark Pulse could not, back in the KrowTite era.
While Snow Warning will probably see some use, especially against teams weak to weather, Hyper Voice's ability to go through substitute is very valuable as well.
EDIT: Since it was brought up in the smogcast, I thought I'd demonstrate some of the effects of a higher level on damage (isolating all else). For this, I used two Celebi, one at level 100 and the other at level 50. I gave both Tackle, and then customized the level 100 to have an identical HP, attack, and defense stat, by making it have base 17 HP (175 HP) and base 57 with 1 IV attack and defense (120 Atk/Def). I then pitted their tackles against each other (note that level is the only different quantity).
Level 100 on 50:
0 Atk Celebi Tackle vs. 0 HP / 0 Def Celebi: 37-44 (21.1 - 25.1%) -- 0% chance to 4HKO
Level 50 on 100:
0 Atk Celebi Tackle vs. 0 HP / 0 Def Celebi: 20-24 (11.4 - 13.7%) -- possible 8HKO
That's almost doubled damage, as you would expect from the formula. This is probably for later, as opposition for increasing the level cap of LC as discussed in the Smogcast.
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