Here's my submission:
HP 105
Att 80
Def 105
SP.Att 85
SP.Def 105
Spd 75
BST: 555
Physical Sweepiness: 105. Rank 0. Average
Physical Tankiness: 156. Rank 4. Very Good
Special Sweepiness: 110. Rank 1. Above Average
Special Tankiness: 156. Rank 4. Very Good
Offence/Defence Balance: -18.9. Moderate Bias to Defence
Physical/Special Bias: -2.9. No Bias
Overall Rating: 419. Very Good
Reasoning: We want this poke to be somewhat defensive. With this Spread it can be either physical or special tank or somewhat mixed and at the same time hit back reasonably well.
105 Base HP means you can achieve 404 hp and 101 subs without the full EV investment and base 105 defences means it can take hits very well from either side of the spectrum. The question then becomes "which do you fear most?".
Physical Ground is everywhere. Without STAB, however, even a CB Adamant Metagross fails to OHKO with EQ if you're running 252Hp/252Def, doing at most 73.43%. Leftovers versions even fail to 2HKO. Compare this with Adamant CB Rampardos who still only does 85.02% which fails to OHKO even with SR factored in. With STAB, the strongest you'll find is Rhyperior's, whom will only OHKO if running a Choice Band with Adamant 74.36% of the time. Mamoswine, who's EQ is 2nd strongest, achieves this only 58.97% of the time.
Special Ground is just about never found STABed. The strongest one would be Camerupt's Earth Power which fails to OHKO even with a +Sp.att nature and Specs, even with SR assuming the same defensive spread with Sp.def instead of Def. It does at most 83.09%. Without STAB, the strongest is Heatran's which does at most 43% with Modest nature, 55.56% with Life Orb and 64.25% with Specs. Timid with LO does at most 51.21% and with specs does at most 58.45%.
Physical Ice almost needs no mention as the strongest Ice attack is Ice Punch, which is strongest coming from adamant CB Weavile and does at most 75.85% assuming the same spread. Jolly CB Weavile does at most 69.57%. LO Jolly Weavile barely guarantees the 2hko doing a minimum of 51.21%. Dropping lower than that loses the guarantee. Mamoswine has a higher Attack stat, but has only Avalanche at his disposal for a strong hit, doing at most 64.25% with a +nature and CB. Dropping any lower than that loses the guarantee unless Avalanche gets the boost from being hit.
Without STAB, the only worthy mention is DD-Gyarados, who after one dance deals at most 58.94% with a +nature and LO with Ice Fang, but he's still better off just using EQ instead which deals at most 90.34% under the same circumstances.
Special Ice is of slightly higher concern, but still not significant. The strongest STAB Ice beam comes from Glaceon and with a +nature and specs only OHKOs 15.38% of the time. Switching to Life Orb means doing at most 88.41% which only OHKOs with SR 2.56% of the time. With Blizzard, however, it's a guaranteed OHKO with +nature specs and 92.31% of the time with a neutral nature. +nature with LO OHKOs with Blizzard 66.67% of the time and neutral nature LO only 7.69% of the time. Dropping any lower than this is a 2HKO at best.
Without STAB the Strongest Ice Beam comes from Porygon-Z and does at most 69.57% with a +nature and specs. With LO it's a barley guranteed 2HKO doing at minimum 51.69%. Dropping lower than this loses the guarantee. With Download, +nature and specs, however, Ice Beam OHKOs 28.21% of the time.
Saying this, if we give this pokemon Thick Fat, Ice will be of even lesser concern.
Then we finally have Dragon. +Nature LO Salamence's Outrage will OHKO 79.49% of the time before getting in any DDs, whereas neutral nature LO Outrage will OHKO 28.21% of the time. Without the LO, however, 'Mence will only OHKO with a +Nature and SR 2.56% of the time. Pull off one DD in any situation, however, and it's gg for our CAP. Specs versions will always OHKO with Draco Meteor regardless of nature, but fails to OHKO with Dragon Pulse, even with a +nature and SR factored in. LO variants will OHKO with DM 87.18% of the time with a +nature and 28.21% of the time with neutral. LO Dragon pulse will always 2HKO regardless of nature assuming 252 EVs. Same calcs apply for Latias as they share Sp.att.
80 base attack means that with a neutral nature and no EVs, You score a guaranteed 2HKO on no Hp/Def Kingdra, Flygon, Latias and Salamence with Dragon Claw, provided you can evade the Intimidate reduction with the latter, and also Dragonite 66.54% of the time, which elevates to 100% with SR factored in. All of these of course require advance scouting and that you switch in after they've downed one of yours. With Thunderpunch you will always 2HKO 4hp/0def Gyarados after Indimate factors in, and OHKO 87.18% of the time without Intimidate. Further, you'll also have a shot at 3HKOing MaxHp/Def Bold Vaporeon and Milotic before Marvel Scale and a shot at 2HKOing minHp/min Neutral defense Empoleon, and with a minor investment in attack these chances become guarantees. You also 3HKO none-roost maxHP/minDef Togekiss. You fail, however, to 3HKO Max Hp/Def Bold Suicune without massive investment, unless we chose to give this one Volt tackle, which without any investment is a guaranteed 3HKO.
85 base Sp.Att means that with a neutral nature and no EVs it's a guaranteed OHKO on 4HP/min Sp.def Gyarados, a 2HKO on Max Hp/0 Sp.def Skarmory and a 3HKO on Max Hp/220 Sp.def Calm Zapdos and MaxHp/224Sp.def Arghonaut with Thunderbolt among others. Further, Dragon Pulse will be a stronger attack on other Dragons than Dragon Claw was.
75 Base speed outruns I think all slow tanks and sweepers like Skarmory, Blissey, Hippowdon, no speed-Tyranitar etc without any investment. Further, should we chose to give this pokemon Dragon Dance, it'll outpace things a lot quicker than Tyranitar would've
So, what do you think?
EDIT: The defensive calcs I made were with a +nature in the corresponding defences. My bad
