96 Attack is a pretty crucial point IMO. With it, you always OHKO 4 HP Mew and Shaymin without hazard support, doing a minimum of exactly 100%, you always OHKO Chandelure after SR, Darmanitan after Spikes, 4 HP Roserade, 2HKO Mismagius with any prior damage at all, doing 49% minimum, 2HKO Cobalion with a layer of Spikes so it can't set up, 2HKO the bulkiest Slowbro with Megahorn, do enough damage to Honchkrow to prevent it substituting about 50% of the time (if it lives it does so by the skin of its teeth), OHKO 4/0 Raikou with EQ 100% of the time if Spikes and SR are on the field, although you shouldn't stay in on it since Tbolt does a ton, and 2HKO offensive Kingdra with Megahorn.
188 HP, on the other hand, means that offensive Rose cannot 2HKO with Sludge Bomb without hazards, Jolly Choice Band or Guts-boosted Heracross Close Combat cannot 3HKO you without the same support, and must roll effectively max damage all three times to KO after 1 layer of Spikes, defensive Hitmontop will sometimes fail to 2HKO with Stone Edge, bulky Empoleon Scald cannot 2HKO unless it burns you and Claydol cannot 2HKO with Earth Power even with a couple of layers of Spikes and often even with Stealth Rock, while Megahorn easily 2HKOs even the most physically bulky of Claydol.
There could be a better defensive spread, I'm not sure, once I found the "magic" attack point I just dumped everything else in HP. Leftovers doesn't get the same KOs though (obviously) so I think and alternative spread might be better for that. It's worth noting that even with maximised attack, Leftovers has significantly lower damage figures, a spread that just emphasises bulk (perhaps the same speed with a HP/spdef split?) might be a better option.
I calced everything I imagined Solipede might want to revenge kill, but I may have missed something. Let me know if I did. Also, perhaps it would be a good idea to put some of these calcs in the analysis? For someone unfamiliar with Scolipede, Life Orb might seem like a strange choice on a Spiker, although I should put more emphasis on the fact that Scolipede is an offensive Spiker and not intended for more defensive teams.
From Hell's Heart I Stab at Thee