There are a few ways of doing this, since Atma Weapon is made of pure energy.
1. Use either Rasp or Osmose to deplete Atma Weapon’s MP. When Atma Weapon’s MP reaches 0, he goes bai bai. But this way takes a while.
2. Use your strongest attacks and spells on him…
Don’t for get to heal in both of these ways to defeat him…
OR
You can just go with #3 and use the Vanish/Doom trick..
If you aren’t sure about your levels, then go raise them a few before going to tackle this beast again.
I never really had a problem with the game since I’m one of those guys that likes to explore every last place in the game and gets alot of levels in the process.
i dont heal and then i let everyone use bolt2 until he�s finished.
terra uses morph and then bolt2
I would reccomend getting all party members to at LEAST lvl 30 before you go beat the floating continent (EVERYONE..) it really helps later on in the 2nd world
The games really challenging then.