[Deck Knight]

So I did a complete overhaul on this after tunning some calcs. There isn't really a legendary-powerful Bug type mon, I figure we might as well make one, especially considering the competition.

Final Submission:

101 / 110 / 110 / 98 / 73 / 108

HP: 101
Atk: 110
Def: 110
SpA: 98
SpD: 73
Spe: 108
BST: 600

PT: 194.1474 (Excellent)
ST: 131.2939 (Good)
PS: 198.2159 (Excellent])
SS: 177.6370 (Excellent)
Overall: 397.3036 (Excellent)

ODB: 0.1690 (slightly biased towards offense)
PSB: 12.2215 (Heavily biased towards physical)

Overview:

Speed: The most important thing about this Speed is it ties a lot of potential checks (Infernape, Terrakion, Specs Keldeo in Rain) and makes it so their Scarf versions are still risky against a +1 Speed CAP 4. It also makes it so that there are several important faster Pokemon (Gengar, Latis) that, while not acting as Counters, can successfully revenge kill CAP 4. It also allows us to outspeed Scarf Tornadus-T after a Weak Armor/Quiver Dance boost (or with Scarf) with a +Spe nature and any Hidden Power. It's got sufficient stats for pulling off a Quiver Dance sweep, and enough Defense to take a hit if it needs to use Tail Glow, which is an astounding stat booster.

While it's maximum speed is important, so is its minimum speed. With a single Speed EV CAP 4 hits 253 Speed. With a Quiver Dance Boost plus a Weak Armor Boost, its Speed goes up to 506, Faster than Deoxys-S, and it can use what would have gone into those speed EVs into an offense or defense. It's quite elegant.

Attack / Special Attack: Attack is at the limit of Physical Sweepiness for this Speed. It's really crucial the Base Stat be as high as possible to maximize the benefit of Weak Armor on a Choice set, and 110 Attack is as low as I'm willing to go on that. Special Sweepiness was determined after running a number of mixed calculations and coming to the conclusion 110/98/108 satisfied the needs of a mixed set and a special attacking set with Psyshock. Both Swords Dance and Tail Glow are viable at 108 Speed with their given bases.

HP / Defense / Special Defense:

I was determined to have Defense be higher than HP on this no matter the outcome, so I kept Base Defense at the same level and tweaked HP to get the desired results. Special Defense was then tailored to be the CAP's weak point, but not minimized as previous in order to allow consideration for something other than just a special set. HP is now high enough to pull off 100 HP Subs, which will be excellent if we end up putting Focus Punch (by definition a risky move) on CAP 4. I think it still qualifies as "High HP," though its obviously not defining like it would be for Hariyama.

Aesthetics: I have always preferred Bug types to have lower HP than at least one of their defenses, and I think this is an elegant way to present a Psuedo-legend strength set that is neither overpowered nor boring to look at (oh look all 100s whoopedy-do). It should achieve what it needs to do without going overboard.

Set Assumptions:

In lieu of a large number of calculations I ran out of time for, here are some calculations on a given set and the EVs.

Mixed Attackers:

Megahorn is the star of the show here as it has enough Base Power to make a mixed set viable with minimal investment in Attack. The other two moves are Psychic and Focus Blast since they provide the best power/coverage combination.

Set EVs: 20 Atk / 252 SpA / 236 Spe
Nature: Hasty or Naive
Stats: 343 HP / 261 Atk / 256 Def (or 230) / 295 SpA / 182 SpD (or 163) / 342 Spe
Item: Life Orb

[Speed is Tornadus-T Neutral nature Max +1, so a Weak Armor Boost outspeed Scarfnadus]

Potential Boosters: Tail Glow, Quiver Dance, Work Up/Growth

Megahorn calcs:
Jirachi (OU Specially Defensive) Megahorn 46.28 - 54.45% [2HKO with Spikes]
Xatu (OU Physically Defensive) Megahorn 53.59 - 63.47%
Blissey (OU Support) Megahorn 56.44 - 66.56%
Slowbro (OU Calm Mind) Megahorn 63.95 - 75.88% Psychic 60.15 - 70.81%
Mew (OU Support) Megahorn 67.57 - 79.7%
Reuniclus (OU Calm Mind / Trick) Megahorn 75.94 - 90.09%
Latias (OU Physically Defensive Calm Mind) Megahorn 79.94 - 95.05%
Reuniclus (OU Offensive Trick Room) Megahorn 106.84 - 125.91%

[Comfortably KO's all below Jirachi at +1, KO's Latias with SR up.]

+3 SpA:
Jellicent (OU Special Wall) Psychic 69.55 - 81.93%
Dragonite (OU Tank (Rain)) Psychic 73.05 - 86.26% [KOs with SR to eliminate Multiscale]
Gastrodon (OU Tank) Psychic 75.11 - 88.73% Focus Blast 67.13 - 79.1%
Bronzong (OU Tank) Focus Blast 76.03 - 89.94% Megahorn 45.26 - 53.55%
Scizor (OU Bulky Swords Dance) Focus Blast 95.93 - 113.08% Psychic 53.77 - 63.37%
Skarmory (OU Specially Defensive) Focus Blast 96.1 - 113.17% Psychic 53.89 - 63.77%
Jirachi (OU Substitute + Paralysis) Focus Blast 96.39 - 113.85% Megahorn 51.8 - 60.94%
Volcarona (OU Bulky Quiver Dance) Psychic 101.34 - 119.94%
Heatran (OU Weather Trapper [Chople Berry]) Focus Blast 102.16 - 120.67% Psychic 57.71 - 67.9%
Tornadus-T (OU Placeholder) Psychic 143.47 - 168.56% Focus Blast 63.54 - 74.91%
Ferrothorn (OU Standard) Focus Blast 150.56 - 178.12% Psychic 42.32 - 50%

+1 SpA:
Dragonite (OU Tank (Rain)) Psychic 43.78 - 51.81%
Skarmory (OU Specially Defensive) Focus Blast 57.48 - 67.96% Psychic 32.63 - 38.62%
Scizor (OU Bulky Swords Dance) Focus Blast 57.84 - 68.02% Psychic 32.26 - 38.08%
Jirachi (OU Substitute + Paralysis) Focus Blast 57.89 - 68.42% Megahorn 51.8 - 60.94%
Heatran (OU Specially Defensive) Focus Blast 75.58 - 89.09% Psychic 21.29 - 24.93%
Tornadus-T (OU Placeholder) Psychic 85.95 - 101.67% [Always KOs with SR]
Ferrothorn (OU Standard) Focus Blast 90.9 - 107.1% Megahorn 35.51 - 42.04%

Conclusion:

This CAP 4 Stat spread combined a chokepoint speed number with enough offense to attack out of the box physically, and enough defense to utilize a number of stat boosters, having a raw physical defenses slightly greater than Tyranitar, and a special tankiness that is only mid-ranged, but becomes quite effective with a QD boost. I believe it fulfills the discussion parameters we've had so far to an excellent degree, having a number of situational checks. It is also fast and powerful enough to make use of all abilities, without being so fast or so powerful that it cannot be realistically revenge killed. In short, it retains its riskiness to use while being able to competently pull off a sweep if it comes in with the right combination of factors.