zanmato , possibly

One time I gave him like.. 1 gil. He done Zanmato.. he done it 5 times, [5 battles] in a row. All I gave him was 1 gil. [2 of the battles he done it on the summon, no gil required]

[Then again, that was around the time Yojimbo was summoned every battle.. then I got Magus Sisters and Anima.. Heh..]

http://db.gamefaqs.com/console/ps2/f..._yojimbo_a.txt

That will give you all and everything in concerns to Yojimbo and Zanmato.