@DragonRanger  
Or animation; iirc from S2, final animation on an episode wasn’t done until about a month before it aired.

@Background Pony  
Ahahahahahah, maybe magical girl style temporary transformation so they can nuke some big bad.
 
:p

Judging by how late into production this would be, this probably has to do with the finale.

Make everybody alicorn ?
 
->

DAAAMMMMMNNNNNN YOOOOOOUUUUUU