Video Games Help..FFX

I cannot beat Sin before opening its mouth

so wt i need is: Where could i find the weapons when its used the impact on the opponent would total to 9999
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I heard that Kimarhi's sword is found in the Lightning plains..Could someone tell me its exact location?

 

Summon one of the "super Aeons", that is, Bahamut, Anima or the Magus Sisters. They can all do over 9999 damage each, up to 99 999 if I'm not mistaken. They do more damage based on how powerful your Yuna is. That's my strategy, to take advantage of the fact that Squaresoft completely overloaded the Aeons.

 

I used Bahamut and its total amount damage taken by sin when i use the overdrive is about 23,000
and sin always open its god-damn mouth after i use that move

 

Hmmm ... trying to think here ... Try training Yuna some, then fighting it. That'll make all your Aeons stronger. That's all the advice I can give you ... and all I'll be able to give you without playing through the game again ... I don't have 40-50 hours to spare at the moment ...