Someone mentioned this in the N / C moveset thread, and I was surprised to see that it was not on the analysis. I asked permission and wrote it this evening. Its a relativly simple set so I didn't feel that it needed too much explaining. I was unsure about the EVs, I decided in the end that emphasising HP and SpA was more important than Speed, as you want to come in on things that cant hurt it, Tentacruel for example and then hit things on the switch, but I'm prepared to be swayed. So any thoughts?
http://www.smogon.com/dp/pokemon/regice
[SET]
name: Choice Specs
move 1: Ice Beam
move 2: Thunderbolt
move 3: Hidden Power Ground
move 4: Explosion / Focus Blast
item: Choice Specs
nature: Quiet / Modest
evs: 252 HP / 252 SpA / 4 Spe
[SET COMMENTS]
<p>Due to its considerable bulk, Regice has the ability to switch in regularly and dish out damage. With the Choice Specs, Regice’s Special Attack stat reaches a respectable 492, allowing it to hit hard with any unresisted attack. Thunderbolt and Ice Beam provide excellent coverage, and Hidden Power Ground hits, for super effective damage, anything that resists the Bolt/Beam combo, mostly notably Magnezone
and Heatran. Explosion will put a large dent in Blissey, but won’t manage to KO unless it has taken 30% or so damage first. Focus Blast will do 33-40% to Blissey, but comes with the added bonus of OHKOing most Tyranitar. Even a 252 HP / 252 SpD variant will be OHKOd 80% of the time with Stealth Rock down. The
EVs emphasize Regice’s bulk, but you may choose to invest more in Speed to hit specific targets. If you wish to do this Modest nature is recommended, but remember that it will detract from the power of Explosion.</p>