It's actually HP x 2, Def+2, Sdef+2.
I don't understand this- Doesn't that give HP LESS weight on general tanks than the other two? Unless something has stats like Shuckle, (let's assume, for simplicity, that what we're discussing has equal defenses) that means it's best to max both defenses and give 4HP instead of maxing HP and giving 128 to each defense. That sounds off to me.
To clarify-
Max IV, 0 EV Neutral Nature steelix has:
291HP
392 Defense
166 SpDef
Using your method, you need to make his defenses as close as possible to 582 (291x2) That means maxing SpDef, then maxing def, then adding 4HP EVs.
The numbers are then
HP: 292
(HPx2: 584)
Def: 449
Spdef: 229
I guarantee that he's more "generally tankish" with a build more like 252HP, 252Sdef, and 4 Def. With my figures:
HP: 354
(HP/2: 177)
Def: 393
SDef: 229
Of course, his nature would be +SDef or +Def if looking for general Tankishness. 10% is a percentage, though, so no matter what you do one side of the spectrum takes 10% less and one side takes the same amount as before. Since he takes more damage specially, the 10% would help more there, but it won't make a terribly high difference.
Damage Percent Calculations:
Deoxys-F with a neutral nature, 252 in both attack stats (making them equal), using a neutral-type (ghost specifically), 100-BP attack.
This is unrealistic, but has basically no modifiers (like weakness or STAB) and no difference in power, and as such makes a very good base.
Your Steelix physically:
11.64% - 13.70%
Your Steelix specially:
24.66% - 29.11%
My Steelix physically:
10.73% - 12.71%
My Steelix specially:
20.34% - 24.01%
The difference, while somewhat minute, shows that my formula is more effective. Please tell me if I've made an error somewhere.
