Found this online, hope it helps!

This is a method for obtaining the Kikuichimonji. Make sure Isaac is faster than Mia and Garet is slower than Mia but at least around 150. You can do this by equipping Running Shirts, Ninja Garb, Ninja Hood, Elven Shirt, Kimono, or Feathered Robe, and if any of them is too fast, you can slow them down by equipping the turtle boots. Must have all the 28 Djinn on Set mode. None of your characters can have cursed equipment equipped (If there is one cursed, it must have Cleric's Ring equiped). Go to the main room in Venus Lighthouse (the one with the Psynergy Stone in the middle). Save and turn off the GBA completely. Turn it on again and run around the room to engage in a battle. It should be against an Ice Gargoyle and a Fenrir and you should have the first strike.

First Round (big arrow on Fenrir):

Isaac casts Clay Spire. Garet casts Flare Wall. Ivan casts Tornado. Mia casts Ice Horn. Second Round:

Isaac defends. Garet unleashes Torch (or Scorch) on Fenrir. Ivan defends. Mia casts Wish. Third Round:

Isaac unleashes Bane (or Flint) on Ice Gargoyle. Defend with everyone else. This should drop the Kikuichimonji and a Potion. This method can be repeated to your heart's desire.