You can get the Ninja Pig Spell Card as a regular spell to your spell book after defeating Koto in Cave of Solitude in Mooshu. He does not always give it to you right away. I had to fight him about 3 or 4 times to get it.
I've fought Koto about 60 times and I have not received the spell yet. I know it is random so I just have keep it up. The last 5 times I fought him, he did not drop any items (only experience). Is this odd? The first 55 times he consistently dropped 1 to 3 items.
but every level can get this spell right? since i have fought him 72 time and still haven't gotten anything, i also do team with a lvl 85 storm but since he got it and i didn't i was just wondering if it had a lvl requirement to get it as drop