Alright, maybe their are already a dozen topics about this, but I didn't find any, so the question: How do I beat Bahamut?

I have tryed, every things, I even beated the annoying Red Dragons etc. But then Bahamut, I arrived at him, he appears, and one attack of him and I am death.

So plz help me, and no reactions plz from oh, i did beat him in 12 seconds or, I didn't know there was a Bahamut in FFVIII, cause I only need an answer to my question