Yes you can, to level up faster, customize your weapon, you need to have: overdrive->ap, triple ap, and triple overdrive then fight the strongest tonberry in the monster arena (forgot the name). Set your overdrive mode to stoic or comrade as the case may be. Attack the tonberry with the character with most monster kills and tonberry will counter with everyone's grudge in my case it hits 99,999 revive him then repeat (for three times i think) then flee, or if you can kill him do so. You'll gain 99 sphere levels.
Ultima buster drops weapons with triple ap,triple overdrive, and overdrive->ap, as i recall...
Ultima buster drops weapons with triple ap,triple overdrive, and overdrive->ap, as i recall...
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