Simisage @ Flying Gem
Trait: Overgrow
EVs: 4 HP / 252 Atk / 252 Spe
Nature: Jolly
~ Acrobatics
~ Seed Bomb
~ Substitute / Low Kick
~
Endeavor
I wish I could remember who posted the idea for this set first. Whoever did, it's awesome, so thanks for that :). (Thanks to Sweet Jesus, btw. This set is much more effective with Simipour, so yeah.)
Simisage has always been my favorite of the Ape-Trio. I mean look at him, he's a badass! Aside from that, I really love Grass- / Flying- / Fighting- coverage, as it allows you to hit near anything in the tier for a good chunk of damage. For starters, you see the Flying Gem, and many of you may roll your eyes and say "we all saw this one coming.", but I dare to say that it's different, mainly for the use of Endeavor and Substitute. The combination of two puts Simisage into Overgrow range quickly and safely, as most of the time he's going to be behind a sub before he Endeavors. The EVs are pretty standard, maximizing Attack and Speed with some Defense to make more subs and such. Jolly nature is for the extra Speed, which I prefer on my Simi personally. But if you feel like you want to go with Adamant, then be my guest. Acrobatics is a big part of the set; with it, it hits Scolipede extremely hard, probably OHKOing standard Offensive Spikes variants (I need to calc when I get home, so bear with me.). It also has great synergy with Seed Bomb. With Seed Bomb, Simisage's STAB, I hit many dangerous mons such as Carracosta and Golurk for SE Damage. Substitute is first, as it helps Simi avoid burns and get to Overgrow faster. Low Kick, however, can be used if you hate Steel-Types that much and don't want them stopping your sweep. Endeavor remedies this, however, as it whiddles them down with you to low HP, making it easier to wipe them out with Seed Bomb.
As mentioned by the original poster, a fantastic partner is Rocky Helmet Carracosta, who can set up rocks and weaken the Fire- and Flying- Types that endanger Simisage and prevent it from sweeping.