Okay, it is really easy. But make sure you attack in this order:

Ivan, Isaac, Mia, Garet.

Go to the first room in Venus Lighthouse, the one with the psynergy stone and the three doors. Save. Then turn the game off and turn it back on. NO SOFT RESETS! Resume your file and walk around in the room. The first battle should be a Fenrir and a Ice Gargoyle.

TURN 1

Ivan - Tornado (Big dot on Ice Gargoyle)
Isaac - Clay Spire (Big Dot on Ice Gargoyle)
Mia - Ice Horn (Big dot on FENRIR)
Garet - Flare Storm (Doesn't Matter)

Ice Gargoyle should die First.

TURN 2
Ivan - Defend
Isaac - Defend
Mia - NORMAL Wish
Garet - Torch Djinni

You should get the Kikuichiomji or whatever. Then you can keep doing this. I reccomend doing this until you have six. One for Isaac, One for Ivan, one for Garet, one for Felix, one for Jenna, and one for Piers. Then after beating the game. Save and Transfer to GSTLA. You'll have the Kikuichiomji's. And if they don't increase their attack. They are worth LOADS of money.

Hey, it's a RNG! Gaia Blade still does more damage, I think...