I think "inappropriate" by means of the beat will not fit the plot of the movie.
Honestly, I sat there, just plain flabbergasted. How is ice cream going to fit this epic plot? (I told my brother, and he laughed so hard)
But then again, Arceus got trolled with some random, uppity song that involves sailing in the meadow (O.o) while in the movie, it was being betrayed by Damos.
Regarding defining "inappropriate," I believe you were looking back at the AG film songs (minus movie 7) and how serious they were in tune and lyrics. I can totally understand that. I'm in league with you! *salutes*
Can't wait to hear the song preview in the next trailer!