Name: Shell Break
Type: Normal
PP: 15
Description: Lowers defense/special defense. Sharply raises attack/special attack/speed
Learned By:
Cloyster
Omastar
Magcargo
Torkoal
Clamperl - Huntail/Gorebyss
Iwaparesu
Abagoora
Cloyster
Water/Ice
95/85/70
As you can see Shell Break is an amazing move which is probably why GF limited it to so few Pokemon. Cloyster is the first of these. Stats are just high enough to use Shell Break effectively and thanks to Cloyster's high defense stat (even at -1) he should be able to fend off priority which is the bane of any set with Shell Break as due to the defense drops it leaves the user even more vulnerable. Resistance to aqua jet also doesn't hurt. All in all Cloyster is one of the best users of Shell Break.
Omastar
Rock/Water
60/115/55
Omastar is the best user of Shell Break due to one stat - special attack. At +2 Omastar reaches a stat of 722 with a modest nature. Regardless of how powerful Omastar is outside rain. In rain after a shell break this Pokemon is capable of destroying all of current UU and most of OU. To demonstrate the sheer power of Modest LO Omastar in the rain at +2 it does 82.8%-97.5% to standard Wish Blissey so a good chance to 1hko after sr and guarenteed with a layer of spikes on top of that. Omastar is probably the best user of Shell Break and could prove truly devastating with it.
Magcargo
Fire/Rock
50/80/30
In the depths of NU Magcargo has resided with no hope of ever reaching UU. Now with the best addition it has ever gotten he has a decent chance of achieving that. As you can see his offensive stats are pitifully low except for an okay special attack stat. After a Shell Break his stats rise to 388/508/348 speed with a +speed nature of course weaknesses to mach punch and aqua jet severely limit his usability even with Shell Break not to mention his speed still isn't really high enough even at +2.
Torkoal
Fire
85/85/20
Torkoal makes a decent user of Shell Break however that speed (even worse than Magcargo's) holds him back. Even at +2 with a +speed nature he only reaches 308. His high defense will help him survive priority moves except for aqua jet however that speed means he is one of the worst users of Shell Break.
Clamperl
Water
64/74/32
Thanks to the item Deepseatooth Clamperl is just plain scary after a Shell Break reaching a massive special attack stat of 988. Speed holds him back though but he's capable of 2hkoing Blissey after a boost which is no small feat. However, the trouble lies in getting off a Shell Break in the first place meaning Clamperl is a hit and miss user of the move.
Huntail/Gorebyss
Water/Water
104/94/52 and 84/114/52
Thanks to Clamperl these two get access to Shell Break. Huntail can probably make better use of it as he can use a mixed set although Gorebyss does have sheer power without having to split evs. These two among the best users of Shell Break as they have high offensive stats usable speed and good defense (Both 105) allowing them to survive priority even at -1.
Iwaparesu
Bug/Rock
95/65/45
Being a 5th gen Pokemon I don't know much about Iwaparesu but just going by its stats it should be able to use Shell Break fairly well. Bug/Rock aren't the best STABs but a decent attack stat should allow him to muscle his way past opponents. Not bad although nothing special either.
Abagoora
Water/Rock
108/83/32
Not bad stats. Speed is low which hinders his sweeping potential even at +2 however high attack/special attack means he should be able to do a ton of damage. One of the better Shell Break users.
A truly amazing move which vastly improves some Pokemon lower down the tiers. Omastar is the best and scariest user of this move. So what do you guys think? Which Pokemon do you think gains the most from Shell Break?
Type: Normal
PP: 15
Description: Lowers defense/special defense. Sharply raises attack/special attack/speed
Learned By:
Cloyster
Omastar
Magcargo
Torkoal
Clamperl - Huntail/Gorebyss
Iwaparesu
Abagoora

Cloyster
Water/Ice
95/85/70
As you can see Shell Break is an amazing move which is probably why GF limited it to so few Pokemon. Cloyster is the first of these. Stats are just high enough to use Shell Break effectively and thanks to Cloyster's high defense stat (even at -1) he should be able to fend off priority which is the bane of any set with Shell Break as due to the defense drops it leaves the user even more vulnerable. Resistance to aqua jet also doesn't hurt. All in all Cloyster is one of the best users of Shell Break.

Omastar
Rock/Water
60/115/55
Omastar is the best user of Shell Break due to one stat - special attack. At +2 Omastar reaches a stat of 722 with a modest nature. Regardless of how powerful Omastar is outside rain. In rain after a shell break this Pokemon is capable of destroying all of current UU and most of OU. To demonstrate the sheer power of Modest LO Omastar in the rain at +2 it does 82.8%-97.5% to standard Wish Blissey so a good chance to 1hko after sr and guarenteed with a layer of spikes on top of that. Omastar is probably the best user of Shell Break and could prove truly devastating with it.

Magcargo
Fire/Rock
50/80/30
In the depths of NU Magcargo has resided with no hope of ever reaching UU. Now with the best addition it has ever gotten he has a decent chance of achieving that. As you can see his offensive stats are pitifully low except for an okay special attack stat. After a Shell Break his stats rise to 388/508/348 speed with a +speed nature of course weaknesses to mach punch and aqua jet severely limit his usability even with Shell Break not to mention his speed still isn't really high enough even at +2.

Torkoal
Fire
85/85/20
Torkoal makes a decent user of Shell Break however that speed (even worse than Magcargo's) holds him back. Even at +2 with a +speed nature he only reaches 308. His high defense will help him survive priority moves except for aqua jet however that speed means he is one of the worst users of Shell Break.

Clamperl
Water
64/74/32
Thanks to the item Deepseatooth Clamperl is just plain scary after a Shell Break reaching a massive special attack stat of 988. Speed holds him back though but he's capable of 2hkoing Blissey after a boost which is no small feat. However, the trouble lies in getting off a Shell Break in the first place meaning Clamperl is a hit and miss user of the move.
Huntail/Gorebyss
Water/Water
104/94/52 and 84/114/52
Thanks to Clamperl these two get access to Shell Break. Huntail can probably make better use of it as he can use a mixed set although Gorebyss does have sheer power without having to split evs. These two among the best users of Shell Break as they have high offensive stats usable speed and good defense (Both 105) allowing them to survive priority even at -1.

Iwaparesu
Bug/Rock
95/65/45
Being a 5th gen Pokemon I don't know much about Iwaparesu but just going by its stats it should be able to use Shell Break fairly well. Bug/Rock aren't the best STABs but a decent attack stat should allow him to muscle his way past opponents. Not bad although nothing special either.

Abagoora
Water/Rock
108/83/32
Not bad stats. Speed is low which hinders his sweeping potential even at +2 however high attack/special attack means he should be able to do a ton of damage. One of the better Shell Break users.
A truly amazing move which vastly improves some Pokemon lower down the tiers. Omastar is the best and scariest user of this move. So what do you guys think? Which Pokemon do you think gains the most from Shell Break?