how to defeat Rainbow Puni LV16 HP665

[ryouginoshiki]

Its DEF is to high .Is there something made by Alchemy is effective?
shall I make something?

[GerruFin]

They get massive damage while in brake state. Just keep attacking.

[Okamiroy]

It's time to make a new set of your equipment. If you feel hard to make high quality ones, then just increase your stats with traits, such as Well Rounded Power or Speed of Light.
P.S. Not the DEF but the damage resistance is too high. When broken, its resistance will gone.

[栄光の架け橋]

Just attack continuously with the normal physical attack. You'll kill it when it Breaks.

[cadfan17]

The trick isn't just to get them to break status. It's to do so while your heavy hitters are waiting to attack. Try timing it. If you miss the first break the second one takes forever and they heal themselves.