The important thing to know about Ruby Weapon is that he only becomes vulnerable if you have only one character to attack
with. So go into the fight with two people dead, and as soon as he puts the tentacles in the ground, revive them.

For this fight, you also need Final Attack. Get this by winning the special battle at Golden Saucer (read materia section for
more info). Also equip yourself with Master Summon. You can cast the summon magic an infinite amount of times with this, so
if you die, it won't break the pattern of Mimics.

Equip Final Attack and pair it with either Phoenix or Life2. I recommend Life2 because Phoenix only has a maximum of 5
castings.

Now, for the easy part. You've done this. Have Cloud cast K of R, and have the others Mimic it. Repeat this like before.

For beating the Ruby Weapon, you'll receive a headache and a Desert Rose. Give the Desert Rose to the man in Kalm and
he'll give you a Golden Chocobo.
 

That's all there is to it. Good Luck!

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