I'm making a new post, apologies if I was supposed to edit my original post or something!
Anyway, I had chosen terrakion.
Terrakion has a number of strengths in the meta rn. If you look at its stat distribution, it is identical to keldeo, only it has a higher attack than special attack (Both their higher attacking stats are 129 and their lower one is 72.) However, unlike keldeo, it has much more diversity and a far wider movepool. It gets access to much better boosting options in swords dance and rock polish, while also having nice utility moves such as stealth rock and taunt. Also, while keldeo really only has icy wind and a hidden power type outside of its STAB attacks, terrak has earthquake, iron head, poison jab, x-scissor, zen headbutt, and even quick attack. Each move except for probably zen and poison jab have their own advantages. EQ gives terrak stonequake coverage, however is often redundant with CC. I found iron head/ poison jab to be quite nice vs clefable, which thought it could switch into it (Although stone edge from LO is a guarrenteed 2HKO after rocks on 252/252 clef, and band gets the 2HKO all the time, it's nice not having to risk a miss) and other fairies. X-scissor I found myself using quite a bit on scarf sets for starmie, and band sets for slowbro) while zen headbutt really had no use that I could see. Quick attack was something I threw on an SD set once, and I found myself clicking it more than I thought I would against weakened threats such as tornadus who can OHKO with a life orb focus blast, or even offensive zam which took 83 % at least from +2. Band sets however were one of my favorite. Here are some impressive calcs:
252 Atk Choice Band Terrakion Close Combat vs. 252 HP / 144+ Def Hippowdon: 204-241 (48.5 - 57.3%) -- 94.5% chance to 2HKO after Stealth Rock and Leftovers recovery
252 Atk Choice Band Terrakion Stone Edge vs. 252 HP / 56+ Def Gliscor: 175-207 (49.4 - 58.4%) -- 98.8% chance to 2HKO after Stealth Rock and Poison Heal
252 Atk Choice Band Terrakion Stone Edge vs. 252 HP / 240+ Def Mega Venusaur: 153-181 (42 - 49.7%) -- 89.1% chance to 2HKO after Stealth Rock
252 Atk Choice Band Terrakion Close Combat vs. 252 HP / 252+ Def Quagsire: 234-276 (59.3 - 70%) -- guaranteed 2HKO after Stealth Rock and Leftovers recovery
It seriously doesn't mess around. However scarf is nice as well, being able to revenge kill plenty of fast threats like tornadus, weavile, alakazam, +1 zard X, gyara, or d-nite (which is huge) And fast electrics were all very nice.
However, it is not a perfect pokemon. It is weak to nearly every priority in the book, so things like scizor, azu, and breloom can all threaten him out. Also it absolutely hates status, especially para and burn. There were times when I played terak way too conservatively because I feared a will-o-wisp or t-wave. It also doesn't love to be a team's only way of handling things like talonflame (literally like the only rock type that doesn't switch into talon :P ) I played it a lot like LO torn-t sometimes, because like hurricane, even though terak WANTS to get in and spam stone edge to kingdom come, it really can't because of the accuracy.
I built around terrakion by deciding to use a life orb set. I thought it would be cool to have a stealth rocker that could seriously put out damage. At first I paired it with bisharp, because I fricking love bisharp. But then I realized that this topic is all about experimenting with certain mons in OU, so I switched to mega absol. Now, I was expecting it to be like really bad but tbh it wasn't. I started an alt on the low ladder at like 1200 and literally no one knew how to deal with it. They didn't know it got sucker, magic bounce, SD, fire blast, ice beam or play rough. Next I decided we had a seriously unpleasant fighting and fairy weakness. Talonflame filled both these weaknesses super well. Also, mega absol got magic bounce which was nice to help keep rocks off the field (Not that absol was exactly switching into many rockers, but it certainly didn't hurt) Then I felt sad at how I didn't really have much hazard removal. Also, I love FWG cores on these types of teams. I wanted to have something that was another fighting resist, and could remove hazards along with switch into keldeo because atm it just clicked either STAB and won. I was debating between latios and starmie, but in the end LO starmie was chosen because it synergized better with talonflame, and dat bolt beam coverage. Next, I found myself still struggling with fairies - with rocks up, talon was NOT a switch in. I also needed a way to handle lop better than talon, cause right now that was kinda all I had (Also, a weavile check would be nice). Aaaaaaand I wanted some way to bring in terrakion and mega absol as much as possible, so U-turn, Baton pass, or Volt-switch was a must. Finally, healing wish would be lovely because I had at this point a lot of mons that got worn down quite quickly. So, ScarfRachi was what I chose. Finally, I wanted a way to take a big chunk out of talon, and be an all around check to bulky waters. I had hazard removal so sash loom was chosen. The priority is nice, and I love being able to rock tomb any bird. Here's the pasatebin cause I am not a clever man and can't get the "Show/ Hide" command to work.
http://pastebin.com/YjUUwjSc
I think the meta is in favor of terrak. I feel like its wallbreaking power is simply unmatched, and when paired with the right mons it can seriously give some people trouble. It fits well on volt turn teams, or highly offensive teams. I didn't use it on balance, however I'm sure band sets would function as great breakers there as well. While it does hate priority, terrakions great speed, utility, and sheer power make it a great mon.