Awakening, easier spotpass?

I playing FE awakening in lunatic mode and my idea is gain points of the spotpass to unlock final emblem (99.999 points) with Chrom used Falchion, so not waste resources and gain points of Spotpass.

But... My Chrom is so weak. (level 8 now, ch 5.)

And I would like that you recommend me the spotpass battle easier for only Chrom...

Note: I don't have DLC and my game is not hacked.