The one on site is very old so I'm giving it a much needed update.
Here are some changes I made:
-Removed curse/counter
-Added Rock Polish Regice
-Made minor change to BoltBeam and renamed
-Put Sleep Talk up for debate as I question its effectiveness
http://www.smogon.com/dp/pokemon/regice
Overview
-Some cons such as lack of reliable recovery, horrible defensive typing (possibly the worst in the game defensively) and Weakness to Stealth Rock
-Some pros such as use able Special Attack unlike Chansey, STAB Ice Beam with Thunderbolt for the infamous BoltBeam, respectable Defense and great use on a Hail team
[SET]
name:Standard
move 1: Ice Beam
move 2: Thunder Wave
move 3: Thunderbolt
move 4: Focus Blast/Charge Beam
item: Leftovers
ability: Clear Body
nature: Calm
evs: 252 HP/252 Def/4 SpD
Why this deserves to be on site:
-Spreads paralysis like a disease
-Most of its common switches hate being paralyzed
-Has BoltBeam which means it has excellent coverage with just 2 moves
Additional comments:
-Can run different spreads should you want more Special Attack or Special Defense
-The last slot is up for preference and there are many options; Focus Blast,Charge Beam Seismic Toss and Regice is a great user of Rain Dance also because it eliminates it's fire weakness and has the bulk to pull it off
Counters:
-Physical attackers that don't mind paralysis such as Hariyama
-Chansey or anyone else who can just stall this out
-Fire types who are neutral to Thunderbolt with good Special Defense and don't mind paralysis
-Steels should they not mind being paralyzed
[SET]
name: Rock Polish
move 1: Rock Polish
move 2: Ice Beam
move 3: Thunderbolt
move 4: Hidden Power Ground
item: Leftovers
ability: Clear Body
nature: Modest
evs: 4 HP/252 SpA/252 Spe
Why this deserves to be on site:
-Can sweep late game when everything is weakened and has a good Special Attack to pull it off
-Outspeeds the entire tier excluding Electrode
-Has near perfect coverage
-Has the bulk to set up a Rock Polish
Additional Comments:
-Entry Hazards make its job easier
-Charge Beam can be used in the last slot to have a method to boost your Special Attack although Regice may have trouble getting all these boosts
-Focus Blast is much more powerful however much more inaccurate which is a turnoff
Counters:
-Chansey stops this cold
-Bulky physical attackers like Hariyama
-Hitmontop and it's Mach Punch is a decent check
-Most steels should you lack Hidden Power Ground
The Set below is questionable due to how easy it is to set up on so could other people please give their opinions
[SET]
name: Rest+Sleep Talk
move 1: Rest
move 2: Sleep Talk
move 3: Ice Beam
move 4: Thunderbolt/Charge Beam
item: Leftovers
ability: Clear Body
nature: Calm
evs: 252 HP/252 Def/4 SpD
Why this deserves to be on site:
-Good check to special attackers and gives Regice a way to recover health and remove the hated Toxic
-Compensates for Stealth Rock making Rapid Spin no longer a necessity (but still a recommendation)
Additional Comments:
-Charge Beam can be used to boost your Special Attack and make Regice more threatening
-Toxic or Thunder Wave can used in the last slot however it should noted this gives you much less coverage
-Entry hazards are useful for stalling
Counters:
-Once again Physical attackers have little trouble here
-Steels or Fire types
Team options:
-Choice Scarf Dugtrio of Life Orb Dugtrio are great partners for eliminating Chansey or checkmating a weakened Registeel
-Rapid Spin support is a necessity as Regice will be too weak to wall effectively especially since it lacks reliable recovery
-Hitmontop is has excellent synergy with Regice as makes short work of Steels and Chansey and also provides Rapid Spin support,
Regice also does nicely against some of Himontop's counters
-Dophan can take some physical beating provide Rapid Spin support and deals with Steels and Chansey as well
-Azumarill is also a decent partner as Regice can take care of it's counters
-Altaria is a decent partner typing wise as Altaria can shake off Fire and Fighting attacks while Regice
has no problem shaking off Ice attacks
Optional Changes:
-Regice can work great on a hail team with Snover providing infinte Hail with a set consisting of Blizzard,Ice Beam,Thunderbolt and Toxic however this makes more pokemon weak to the same type
-Toxic can be slapped on stall sets over Thunderbolt or Thunder-Wave howver this makes Regice extra weak to Steels
-Gravity can be in conjunction with Entry hazards and allows Regice to abuse moves such as Zap Cannon
Counters:
Most were already listed but Chansey, Steel Types and Haiyama are probably the most efficient universal counters
Here are some changes I made:
-Removed curse/counter
-Added Rock Polish Regice
-Made minor change to BoltBeam and renamed
-Put Sleep Talk up for debate as I question its effectiveness
http://www.smogon.com/dp/pokemon/regice
Overview
-Some cons such as lack of reliable recovery, horrible defensive typing (possibly the worst in the game defensively) and Weakness to Stealth Rock
-Some pros such as use able Special Attack unlike Chansey, STAB Ice Beam with Thunderbolt for the infamous BoltBeam, respectable Defense and great use on a Hail team
[SET]
name:Standard
move 1: Ice Beam
move 2: Thunder Wave
move 3: Thunderbolt
move 4: Focus Blast/Charge Beam
item: Leftovers
ability: Clear Body
nature: Calm
evs: 252 HP/252 Def/4 SpD
Why this deserves to be on site:
-Spreads paralysis like a disease
-Most of its common switches hate being paralyzed
-Has BoltBeam which means it has excellent coverage with just 2 moves
Additional comments:
-Can run different spreads should you want more Special Attack or Special Defense
-The last slot is up for preference and there are many options; Focus Blast,Charge Beam Seismic Toss and Regice is a great user of Rain Dance also because it eliminates it's fire weakness and has the bulk to pull it off
Counters:
-Physical attackers that don't mind paralysis such as Hariyama
-Chansey or anyone else who can just stall this out
-Fire types who are neutral to Thunderbolt with good Special Defense and don't mind paralysis
-Steels should they not mind being paralyzed
[SET]
name: Rock Polish
move 1: Rock Polish
move 2: Ice Beam
move 3: Thunderbolt
move 4: Hidden Power Ground
item: Leftovers
ability: Clear Body
nature: Modest
evs: 4 HP/252 SpA/252 Spe
Why this deserves to be on site:
-Can sweep late game when everything is weakened and has a good Special Attack to pull it off
-Outspeeds the entire tier excluding Electrode
-Has near perfect coverage
-Has the bulk to set up a Rock Polish
Additional Comments:
-Entry Hazards make its job easier
-Charge Beam can be used in the last slot to have a method to boost your Special Attack although Regice may have trouble getting all these boosts
-Focus Blast is much more powerful however much more inaccurate which is a turnoff
Counters:
-Chansey stops this cold
-Bulky physical attackers like Hariyama
-Hitmontop and it's Mach Punch is a decent check
-Most steels should you lack Hidden Power Ground
The Set below is questionable due to how easy it is to set up on so could other people please give their opinions
[SET]
name: Rest+Sleep Talk
move 1: Rest
move 2: Sleep Talk
move 3: Ice Beam
move 4: Thunderbolt/Charge Beam
item: Leftovers
ability: Clear Body
nature: Calm
evs: 252 HP/252 Def/4 SpD
Why this deserves to be on site:
-Good check to special attackers and gives Regice a way to recover health and remove the hated Toxic
-Compensates for Stealth Rock making Rapid Spin no longer a necessity (but still a recommendation)
Additional Comments:
-Charge Beam can be used to boost your Special Attack and make Regice more threatening
-Toxic or Thunder Wave can used in the last slot however it should noted this gives you much less coverage
-Entry hazards are useful for stalling
Counters:
-Once again Physical attackers have little trouble here
-Steels or Fire types
Team options:
-Choice Scarf Dugtrio of Life Orb Dugtrio are great partners for eliminating Chansey or checkmating a weakened Registeel
-Rapid Spin support is a necessity as Regice will be too weak to wall effectively especially since it lacks reliable recovery
-Hitmontop is has excellent synergy with Regice as makes short work of Steels and Chansey and also provides Rapid Spin support,
Regice also does nicely against some of Himontop's counters
-Dophan can take some physical beating provide Rapid Spin support and deals with Steels and Chansey as well
-Azumarill is also a decent partner as Regice can take care of it's counters
-Altaria is a decent partner typing wise as Altaria can shake off Fire and Fighting attacks while Regice
has no problem shaking off Ice attacks
Optional Changes:
-Regice can work great on a hail team with Snover providing infinte Hail with a set consisting of Blizzard,Ice Beam,Thunderbolt and Toxic however this makes more pokemon weak to the same type
-Toxic can be slapped on stall sets over Thunderbolt or Thunder-Wave howver this makes Regice extra weak to Steels
-Gravity can be in conjunction with Entry hazards and allows Regice to abuse moves such as Zap Cannon
Counters:
Most were already listed but Chansey, Steel Types and Haiyama are probably the most efficient universal counters