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OSGKO is impossible, so what I am doing is sending Kimahri into Wakka's SG section once he finishes his own. However, I will not be teaching Kimahri any of Wakka's abilities. Once you get the airship, get the Spirit Lance powered up and visit the Fayth chambers to get the stat spheres. Next, finish Wakka's grid. You'll want to unlock Juggernaut (99 Light Curtains), Cactuar King (99 Chocobo Wings), One Eye (60 Stamina Tablets) and Jormungand (99 Petrify Grenades) from capturing. Customize a tetra armlet with these abilities: Auto-haste Auto-protect Auto-potion Stoneproof Equip your new armor and First Strike weapon and prepare to fight Sin. Since Kimahri has no other means of attacking the Fins from afar, you are forced to spam lancet. Do so until the Fin is dead. Repeat this for the other Fin. Switch to the Spirit Lance and attack Genais a couple of times to kill it. Attack the core a few times to kill it as well. Easy. Re-equip your First Strike weapon and confront OD Sin. Switch to the Spirit Lance and then kill off your other party members. Let Sin draw you in once. Use Seed Cannon. Switch weapons and use it again. When you are pulled in for the 2nd time, you are now in attacking range. Proceed to attack and use Seed Cannon until OD Sin is defeated.