- Prevents critical hits.
- Multi-hit moves will always hit the maximum number of times.
- Grants immunity to damage from weather effects.
Level 100 Statistics (see level 5, 50, 100)
Although mostly outclassed as a supporter by Ferrothorn and Forretress, Cloyster makes for a surprisingly deadly sweeper in Ubers. Its horrendous Special Defense makes it difficult to set up, but when it does get that Shell Smash off, there is very little that can stop it. Cloyster requires a lot of team support to work effectively, but it does have the potential to become a fearsome sweeper.
Cloyster becomes incredibly difficult to wall after a Shell Smash, as it is capable of OHKOing many premier Ubers walls, such as Groudon, Lugia, and Giratina, thanks to its powerful Ice-type STAB. Icicle Spear is the crux of the set, because with Skill Link it effectively has a Base Power of 125. With rain support from Kyogre, a +2 Hydro Pump can KO many Steel-types who would normally wall Cloyster. Rock Blast obtains an immediate OHKO on Ho-Oh, and is Cloyster's strongest attack against opposing Kyogre.
Team Options & Additional Comments >>>
Hidden Power Fire can be used on the Shell Smash set to nail Ferrothorn, but should only be considered if Kyogre support can't be managed. Cloyster doesn't really have many options, because Shell Smash sweeping is the only thing it's good at. Cloyster can provide support with Toxic Spikes and Rapid Spin, but Forretress outclasses it. Focus Sash or White Herb can be used to give Cloyster some longevity, but it desperately needs the power a Life Orb provides. A gimmicky Clamp set could be used to get up a lot of entry hazards, but it is extremely situational, as many Pokemon in the Ubers metagame threaten Cloyster.
Checks and Counters
It should be kept in mind that Cloyster is incredibly frail on the special side, to the point where a -4 support Dialga will OHKO it with Draco Meteor after Stealth Rock. As such, pressuring Cloyster with special attackers will severely hamper its ability to get off a Shell Smash. In the event that Cloyster manages to set up, bulky Kyogre is perhaps the best counter to it, because it can take anything +2 Cloyster can throw at it and OHKO back with Scald. Similarly, 252/0 Manaphy can shrug off a +2 Rock Blast and KO back. In the rain, Kingdra can outspeed Cloyster and OHKO it with a special attack. A physically defensive Ferrothorn can just barely take a +2 Icicle Spear and OHKO back with Power Whip. Choice Scarf Darkrai and Shaymin-S can both easily revenge kill Cloyster, although the latter must be wary of Ice Shard. Darkrai also has the added benefit of not being overly troubled by Wobbuffet, who could otherwise trap and kill a Choice Scarf revenge killer.
Priority helps deal with Cloyster very well, so Arceus and Rayquaza make very good checks when running ExtremeSpeed. Scizor is also capable of revenge killing Cloyster after Shell Smash, Stealth Rock, and a few turns of Life Orb recoil. Vacuum Wave users, such as Lucario and Toxicroak, do a fine job dealing with Cloyster as well.