Megas

As much as I enjoy Friendship Games, I feel that it really needed a bit more running time (like being actually an hour and half like most animated films in theaters are) to expand upon a few things such as expanding on the characters of the Shadowbolts.  But thankfully I hear that the EQG special Dance Magic at least did a decent job to give them a little bit more character development, so there's at least that going for them.

eh; it wrapped up their arc by having them learn about cooperation and friendship and portraying them as not truly evil at heart, but I wouldn't say it really gave them character dev. The only two with any personality are still Sour sweet and sugar coat.

They also don't really do a heel face turn so much as the plot glosses over their actions with a "They're being evil for the RIGHT reasons, they're not true villains!" thing by trying to say they screwed rarity for the sake of their schoolmates.

Still wondering where Indigo zapp was during the dance magic thing though.

Indigo Zap took time off to get surgery so she can come back as Lightning Dust