Mane 6 is Twilight Sparkle gang of friends/elements of friendship in Friendship is Magic. I call then the power-puff Girls of the show. Sunset Shimmer was add after being defeated in: Equestria Girls. Want ask a question who would win a battle against each other. With a tool called Google Fight this can happen.
First Round is:
Sunset Shimmer Vs. Fluttershy
The Winner is Fluttershy
Second Round is:
AppleJack Vs. Pinkie Pie
The Winner is: Pinkie Pie
Three Round is:
Fluttershy Vs. Rainbow Dash
The Winner is Rainbow Dash
Four Round is:
Twilight Sparkle Vs. Pinkie Pie
The Winner is: Twilight Sparkle
Five Round
Rainbow Dash Vs. Rarity
The Winner is Rainbow Dash
Final Round:
Twilight Sparkle Vs. Rainbow Dash
The Winner is Rainbow Dash