Final Fantasy IV

Simple, This is the first part of Lunar Ruins whereas I fight Dark Kain.
I play the, risk tactic against this guy here, he's pretty much a piss off unless you have Lunar Certains which gives reflect to the user. Thus preventing you from being Mega Flared.

My strategy 1 would be the Lunar Certains one.
Start off the battle with Dark Kain, do not bother touching him, but change your row to the back instead.
Prepare at least 3-5 Lunar / Light Certains with you, to prevent mega flared at my level, which is uber low.

A : Face off with Dark Kain - Change Row
B : Await till he jumps and turn into Lunar Bahamut, thus, hitting him once, when the timer reaches 2, quickly use one Lunar Certain and continue hitting him.
C : 2-3 Turns after your last Lunar Certain, use another one, as reflect will runs off pretty often, thus making your life much miserable.
D : Sad news guys, once you die here you're screwed, you got to redo the whole damned shit.
E : Lunar Bahamut will go down after 3-4 of your Lunar Certains/ Light Certains are used up.

My strategy 2 would be what I call, The Risk.
Start off the battle with Dark Kain, with you starting first, use a Hermes Shoe to boosts your speed up alittle, thus making it easier to jump and risk.

A : Use hermes shoe during Dark Kain's battle.
B : Change row after using Hermes Shoe.
C : Await the turn timer to be until 2, count in your heart 5 seconds as quickly as possible and jump.
D : Turn should be 1 when you jump, making Lunar Bahamut miss his mega flare.
E : DO NOT ATTACK, I WARNED YOU <- Keep doing this for 30 turns, as he has about 50-60k HP, my damage deals 4k-6k, so i'm abit screwed.

After long beating shit out of this guy, you gain a Abel's Lance and Dragoon Gloves, the best equipment and accessory for Kain.

Abel's Lance : Boosts 255 Attack ( The maximum )
Dragoon Gloves : Upgrades Kain's Jump to Double Jump, making his jump more easily to deal 9999.