I was think of character that crossover to MLP:FIM universe and I don't know "fight" with each other.

Anyway who would you think would win in a battle?

1. Loki God of Mischief vs. Princess Celestia

2. Janemba (from DBZ: Fusion Reborn) vs Discord

3. Mephisto (The Devil in the Marvel Universe) vs Doctor Whooves

4. Guitar Battle: Octavia vs Scott Pilgrim

5. Fastest in the world: Rainbow Dash vs Flash vs Sonic

Give me facts why the pony win the battle.