First off, if there is anything that needs to be established at all, its that Carbink NEEDS Sturdy over Clear Body. Clear Body's main use is shrugging off Sticky Web and Intimidate, neither of which Carbink cares about due to having poor offenses and crap speed to begin with. Sturdy guarantees it'll survive long enough to do something, and it also is the difference between it and Diancie.
Of course in general you'll see it mostly in lower tiers.
With that said, lets move on.
Carbink @ Leftovers
EVs: 252 HP/252 Def/4 Sp.Def OR 252 HP/252 Sp.Def/4Def
An Incredibly standard set for Carbink. Stealth Rock is a handy hazard that controls your opponent's switching, and it has the bulk to run both Screens to support your team. Moonblast is Carbink's most reliable way to hit anything, especially in lower tiers, and prevents it from becoming complete Taunt fodder. Power Gem is a nice alternative for hitting many wea
Though Light Clay is a common option, the lack of reliable healing and the extra bulkiness from behind hazards makes Leftovers a much better tool if you need to set up Hazards or Screens again. Rocky Helmet also appears as an alternative but it lacks any form of recovery to continuously wall.
Bold allows it to take any Neutral hits with ease, allowing it to wall as it sets up screens with little difficulty. Resistances to common physical Fire, Flying, Bug, Dark, and an immunity to Dragon allow it to endure plenty on the physical side. It also is able to take Non-STAB Earthquakes as well.
Calm on the other hand has the benefit of allowing it to endure hits from Bulky waters that attempt to switch in to stop your set up and also allow it to switch in on powerful Fire type STAB from the likes of Eruption Tylphlosion.
Team Options: Carbink benefits quite a bit from having Clerics for support. Due to its low Health, most common Wish Passers can buff it back up with ease, and heal bells deal with it being vulnerable to all forms of status. It also appreciates bulky waters to deal with some of its common weaknesses. A Scarfed attacker is a good way to shut down set up sweepers who come in on Carbink who lacks in the offensive presence to keep the likes of Feraligatr off of him.
Who would win in a fight, Missingno or Diamond and Pearl's incredibly slow abomination of a game Engine?