I just wonder who has completed Jiraya's "100 sparrings". I has completed that event during easy mode during the first try, but, guess how hard it was for me to defeat Jiraya, he always did a large amount of damage so I had to heal myself often
I was able to get it the first try in hard diff, and for me, it is alot more fun when playing on hard. As long as you keep an eye on where the enemy is, it is easier to beat.