I heard that there was a monster on one of the islands at the island chain near the bottom of the map on the first world but no matter what i do it just says 0 damage, what do i do, i think this is that monster.

You can level up. If that dosne't work, but it should. You will need to buy better weapons. Besides those, there are no other ways to get your attack points up.

he's talking about the island at the bottom in the WoB. the reason you cant hit it is cause its a behemoth like monster that is invisible! take mog with you(if you got him!) and use the dusk requiem dance! if he uses snare, he'll K.O. the monster! you DONT get alot of EXP, but you get 10 magic points!

Being invisible means that you're more susceptible to magic attacks. If any of your characters have Doom or X-Zone, it will instantly kill that monster. This makes learning magic for all your characters easier for the World of Balance.

A longer alternative way to kill this thing is have Cyan use his Level 5 Sword Tech against it. Just be careful of its Meteo Spell.

There is a monster on the World of Balance in the right upper corner on an island that also gives you 10ap if you kill it its named Intangir and is Invisibel at the start of the battle, and you can kill it by casting doom on it.

I don't know if you mean that one but if it is try it.