allright I know you are new so I will help you here,but next time make a seperate thread for this...
as for your question about evrae here I go...
at the beginning of the battle have Tidus wakka and rikku in your main party,as the match starts go far away from evrae if you aren't allready,then switch rikku for lulu,then cast here -ara spells on evrae,Cid also helps you buy launching missiles at it but he will only launch them 3 times to don't get to happy.While lulu is doing casting her black mage spells also remember to occasionally cast reflex which increases your evasion.Then have wakka hit him with physical attacks,and have Tidus caste hast on lulu,and let him keep using his ability cheer to make your defence and attack go higher.
once the boss is down to 10 or 12,000 hp things start to get a bit harder,he uses a swooping scythe sttack which makes your strategy blow up in flames.Now switch wakka and lulu in for kimahri and auron and start hammering away!have tidus caste haste on auron then switch tidus out for rikku.If the boss skips the turnand does this weird looking thing it means he is preparing to use his venom attack,the only way to avoid it is by goign far away from evrae,if you get hit with venom don't worry one al bhed potion should put you back in shape,then keep hammering away until you win
PSN-intayaz