http://www.smogon.com/dp/pokemon/swampert
[SET]
name: Spexpert
move 1: Hydro Pump
move 2: Earth Power
move 3: Ice Beam
move 4: Hidden Power Grass
item: Choice Specs
nature: Modest
evs: 252 HP / 252 SpA / 4 Spe
Why this set deserves to be on-site:
-Unbelievably hard to wall, due to sheer damage output
-Beats the most common leads in today's metagame
-Shock value can score you a bonus kill (but doesn't rely on it)
-Currently no similar sets on-site
Additional Comments:
-Expert Belt could also be utilized for free move switching, but lacks raw power.
Teammates and Counters:
-Works well with a secondary Steath Rocks user and a bulky ghost-type
-This set is walled by blissey and bulky waters like Suicune and Vaporeon
First thing off, this works awesome as a lead. It doesn't have to lead and can work well as a mid-game tank, but I have built it for a lead.
To sell you guys, I'm going to show you some calcs on some of the biggest leads in the game.
HP Grass
252 HP / 0 SpDef Swampert = 102% - 120.8%
252 HP / 0 SpDef Suicune = 41.6% - 49%
252 HP / 0 Spdef Vaporeon = 43.8% - 51.8%
Earth Power
252 HP / 0 SpDef Metagross = 108.8% - 128.6%
4 HP / 0 SpDef Heatran with Shuca = 106.5% - 126.3%
80 HP / 0 SpDef Jirachi (after it tricks you scarf) = 67% - 79.8%
80 HP / 0 SpDef Jirachi (if you still have specs on) = 100.3% - 118.6%
Hydro Pump
252 HP / 88 SpDef Hippowdon = 134.3% - 158.6%
252 HP / 224 SpDef Tyranitar with sandstorm = 64.4% - 76.2%
4 HP / 0 SpDef Tyranitar with sandstorm = 93.6% - 111.1%
252 HP / 96 SpDef Machamp = 64.3% - 76%
252 HP / 92 SpDef Bronzong (sassy) = 52.7% - 62.4%
Ice Beam
104 HP / 0 SpDef Crobat = 90.8% - 107.4%
I didn't list some of the more obvious leads like Dragonite and Gliscor who are obviously OHKO'd by Ice Beam and lead apes who are 2HKO with Earth Power. Aerodactyl is 2HKO'd by Ice Beam because of sash.
One thing that should be noted is that Azelf can be a bit hard to take down. Especially if it isn't a taunting Azelf. The recommended strategy is Two consecutive Ice Beams. Usually the Azelf if it wasted a turn taunting you will get rocks up as you KO it, but if it went for Stealth Rocks on the first turn it will usually explode seeing your damage output, this is when running this set with something like rotom comes into play. You will be able to eat up an Explosion and maybe get off a Will-O-Wisp on something else.
This set eats taunt leads alive, obviously as they taunt you you are firing a boosted attack their way. I don't know how many times I've been taunted by Crobat and OHKO'd it right back with an Ice Beam.