train your character near a save game spot.

use ur skills and ur aeons with there overdrives out to quickly and decisively ed this
match if not if your aeons are still weak i suggest using ur ranged attacks and spells to
knock out the padogas and then quickly focus on sin amd the toughest way to do it it takes
long but will hael is getting the secret weps crescent and sigil

good stats, lv.3 magic and aeons are the key what u want is the holy spell lots of ethers
and mp and about 35-55 magic (give or take) so that holy deals a lot of damage. but if u
cant b bothered fighting sin in the fourth stage (were u gotta beat him before his mouth
opens all the way) use zanmato but u will need between 400,000-600,000 gil though so save
up on cash and sell the unneeded items good luck.

Sin isnt hard you just **** get all the aeons including anima yojimbo and the magus
sisters and get yunas stats up becuase the aeons stats go up aswell i beat sin using just
the magus sisters and dont forget sin isnt the last boss