Okay:
Jynx: Easy as hell. Keep yourself alive (bowesr is a good attack char) and you\'ll be golden. Mastering timed defense against his 3rd form is a life saver, because he tends to get 2 or 3 attacks before you get one.
Culex: Take em out in this order: Water Fire Earth Culex Wind. It gets much easier if you use area attacks and wait for their MP to run out. Stock up on royal syrups, using Group hug, Come back, and Geno Flash.
Smithy: Electric Vs tank, Physical Vs Mage, Fire Vs vault head, Ice vs... that freaky pink head thing. Look out, he can cast two arrow/spear rain spells in the same round, effectively wiping out your party if you don\'t have the lazy shell.
Any other probs, just ask me.
Mario: Lazy Shell, Hero Shirt, Quartz Charm
Peach: Frying Pan, Lazy Shell, Amulet
Geno: Star Gun, Work Pants, Jinx Belt