the fifth boss ??? is revealed to be khimari the newest party member the fight is simple survive 3 rounds and see khimaries moves hes a strong character and can learn enemy skills but for this fight just a 0/10 since he cant kill you to my knowledge
sin 1st encounter hes pretty easy and has 2000 HP he has 3 sin scale with him each with 200 if you kill 3 he will summon 3 more so only kill 2 then focus on him with wakka and lulu and if you have valefores overdrive use it on sin and youll make short work of him i rate him 4/10 mainly because its a sin fight and sin is my favorite boss
after you defeat sin you fall into the water and face sin spawn echulles and 4 sin scale its good to blind the boss and use cheer against him he is the first major boss and threat in the early game i give him a 6/10 since he killed me a few times my first playthrough
lord ochu the games first mini boss its power but super weak to fire so lulu and valefore can defeat it easily if you want to wait the second summon is ifrit so you can beat it even faster depending on how much you grind he is really strong and nearly killed me so i give him 5/10
sinspawn geneaux he has a weakness to fire so just use fire on him and he’ll go down he is strong so make sure you have yuna ready to heal he can and will poison you so antidotes are good to have since you can summon valefore and use its overdrive this boss really goes down super fast so i give it 2/10

sinspawn ammes- the first boss he is basicly there to teach you about overdrives your charaters special skills he can only use demi which lowers your HP by 1/4 he cant kill you it is the easiest boss in the game i like the design of the boss overall id rate it 0/10 since there is no challenge or risk of death
geosgaeno 1st encounter it hits hard but wont actually kill you you fight for 3 rounds then escape basiclly it shows you underwater combat (ill discuss him more in depth later in the game) for this encounter since you cant die 0/10
kilkk is the third boss it becomes a normal enemy later in the game the purpose of this fight is to wait it out til a new member rikku joins you and then you learn about the steaaling and using of stolen items its pretty hard to fight this stage in the game but if you heal youll make short work of it (if you dont use the save sphere youll be weak for the boss fight but you can heal if you dont realize youre still low on health he can kill you for that alone hes a 1/10
tros is a squid and the fourth boss he teaches you about trigger comands here you use it to standby which heals you or you can pincer attack which surrounds the boss and makes it easier to survive his attacks hes easy hardest so far but hes still only a 2/10