Board Thread:Questions and Answers/@comment-26501688-20160325044257/@comment-26044227-20160325045400

It'd take hours to train up an Iwatooshi high enough to be useful enough (like, 70+ for even just the first 40 levels of Underground Treasure Chest). If you've got the spare time, it sounds nice, but honestly he won't really need to be repaired that often if he's useful because he should be 1HKOing most of the enemy team anyways. And when he does need to be repaired, it's just a handful of Help Tokens for the whole event. IMO there's no real need to put in all the time to train a second Iwatooshi to be useful.