Crustle@Leftovers
Sturdy
Impish 224 HP, 252 Def, 32 Sp. Def
Spikes
Steal Rock
Stone Edge
X-Scissor
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The Crustle we all know and love. Sturdy guarantees at least SR, and I can generally get down a few layers of spikes, too. If he survives, he's useful as a sponge in the late game when I really can't afford to switch into an attack.
As an added plus, Stone Edge 2HKOs Aerodactyl leads (or 1HKOs if I get a crit), which has come in handy several times. Also, I think people forget that Dark is weak to Bug. I've gotten a few surprise KOs on Absols who seem to think that Crustle is safe to set up on.
Stunfisk@Leftovers
Static
Bold 252 HP, 192 Def, 64 Sp. Def
Discharge
Earth Power
Scald
Toxic
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Everyone underestimates this guy. He can sponge an Earth Power from Nidoqueen and hit right back with Scald or an Earth Power of his own. He's also found use in the ability to take a Facade or Bravebird from Guts Swellow and KO with Discharge, and generally wreaking status among the masses.
Roselia@Eviolite
Natural Cure
Calm 252 HP, 4 Def, 284 Sp. Def
Toxic Spikes
Giga Drain
Rest
Sludge Bomb
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Roselia is just awesome. Rest+Natural Cure means that she can stay in quite a while and sponge any sort of status. However, she has one particular niche that she fills- even after taking Stealth Rock, she can survive a +2 Modest Ice Beam from Omastar and KO with Giga Drain (restoring most of her life in the process). She's responsible for getting me through quite a few Shell Smash Omastars who would otherwise tear right through my team. Sludge Bomb ensures that she isn't walled by other grass types, and packs a punch against Rotom-Grass.
Possible Changes: Toxic Spikes really doesn't see that much use. I might consider replacing it with Aromatherapy to provide recovery to stuff like burned scyther or toxic'd quagsire that would otherwise be screwed.
Scyther@Eviolite
Technician
Jolly 248 HP, 8 Attack, 252 Spd
Swords Dance
Aerial Ace
Roost
Brick Break
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My one and only sweeper, and he excels at his job. Switch in on a grass type (Tangrowth is ideal, since it has absolutely nothing that can touch Scyther), grab a Swords Dance boost, and tear through the enemy's team. I'm very glad that I decided to go for Eviolite. I cannot count the number of times somebody's swung at me with a super effective move, gotten me down to 10%, and promptly been KOed. With the Eviolite, Scyther is as bulky as Roselia, and can hit many times harder.
The only thing Scyther can't do is take out Fire types. They're often either speedy enough to score a hit before I can attack, or bulky enough to retaliate. Stealth Rock support is an absolute must, and I prefer to have all fire types cleared before even letting Scyther out.
Quagsire@Leftovers
Unaware
Relaxed 252 HP, 252 Def, 4 Sp. Def
Scald
Recover
Toxic
Earthquake
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I used to have a Slowking here, but he really didn't add much to the team, apart from occasionally surprising ferroseeds with Fire Blast. Stunfisk was better at status, which made his only redeeming factor his type- he's was the only one on my team who resisted fire.
I mentioned that I was having problems with Feraligatr sweepers. Quagsire is the answer. Drop him in, watch the stat bonuses fall, and start tanking unboosted neutral hits. He's got a serious weakness for special grass attackers, but if the opponent switches to one he's already served his purpose. I haven't had an opportunity to test him out yet, but I'm hoping it'll alleviate the problem.
Possible Changes: Dropping Earthquake for Stockpile would make this thing an absolute behemoth defensively, but it does open itself up for anything with a water immunity, and I want this to be as close to an all-purpose check as possible.
Emboar@Choice Scarf
Blaze
Jolly 4 HP, 252 Atk, 252 Spd
Flare Blitz
Wild Charge
Superpower
Earthquake
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I previously had a foresight+rapid spin Hitmonlee here. However, as I accumulated matches, I noticed that his primary function was as a revenge killer, and an occasional sweeper should the enemy's team have a weakness to fighting. I used rapid spin very rarely (scyther is the only team member who needs the support, and he's better off just switching into a grass type and roosting the damage off), and I used foresight never (the only ghost types I've encountered are Golurk and Rotom. The former can KO me before I get the chance to spin, and the latter can just be KOed with another pokemon anyways). That was all well and good, but I felt as if I were wasting two moveslots, and Slowking's removal left me with exactly 0 fire type coverage.
Behold, the solution. He outspeeds everything short of Accelgor, and hits hard. Ferroseed and Excavalier, two pokemon who would otherwise wall me, are promptly incinerated. He doesn't last long, but he doesn't have to. Once any steel types on the other side are down, he can pop back onto the bench, only to be called upon in emergencies.