-Is it legal to sav Cherish Balls to put a legit Scizor in?
-If I opt to use Abomasnow in Ubers, should I still use Ice Beam and Thunder>Blizzard and Thunderbolt? The prevelance of Kyogre would make Blizzard on all Pokemon a problem if Abomasnow faints, not to mention Id'e want to give a try to double-weather with a Kyogre of my own...
Abomasnow does not learn Thunderbolt, or Thunder for one. You'll likely find that Ice Shard and Grass Knot will be the best tandem of moves in Ubers, letting Abomasnow hit Rayquaza/Shaymin with Ice Shard, and it can attempt to counter Kyogre/Groudon with Grass Knot.
However, never using Abomasnow in Ubers, I don't know what set would work the best. SubSeed prevents it from being totally dead weight when something like Bulk Up Dialga, Forrty, and Scizor come in.