Summit moon also boosts all simple techniques by 30% I think. Regular mst boost really doesn't help much at all!
I use a full arsenal of level 30 techniques (except for grants 25, anti 7 and unleveled techs) on my fonewearl. But since dark resistance doesn't seem to help much, and since no one seems to look at their elemental resistances during PVP I tend to just cast lvl 30 megid until everyone's dead
Either that or the rabarta foie combo. Rabarta until they freeze, then a couple of foies will send them to the floor. Gibarta is useless, though.
Most of the time the key to winning battle mode is either to take your opponent down in one hit, deplete them of healing materials (casts only) or just to freeze them and blast away with some powerful multi hitter like charge vulcs or daylight scar.
Equipment wise I most often go with:
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Psycho wand (for rabarta, but due to HP drain it's not the most useful in battle)/Ice staff dagon
Summit moon (for foie)
Madams umbrella (multi hitter, bezerk function)/Red saber +50 (15% native)
Glide divine (spreads my lvl 30 jellen/zalure everywhere. I use this after using shifta/deband on myself then overwrite my opponents status')
Blue merge (rabarta boost, however does not increase frozen status chance on enemies) / Red merge (foie boost)
L.Mantle armour 4 slots (Gives me trap vision, useful vs casts)
V801 (Increased technique casting speed)
God Technique
Heavenly Mind
Heavenly Mind/Heavenly Arms (depends on if I want to melee)
lvl 200 soniti mag (Casts invincibility on 10% health/PB gauge fills), Mind>Def>Pow>Dex (Dex = 0)
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That's about it folks