This is how Optimus Prime vs Megatron goes in My Little Pony: Rise of the Dark Sparkle.
[Optimus Prime and Megatron face off]
Megatron: I will rip the Element of Magic with my bare hands!
Optimus Prime: You want the Element of Magic? Take it!
[Optimus Prime fires a beam from the Element of Magic, which Megatron dodges and fires a beam from the Dark Sparkle. The beams push each other back then Optimus Prime moves forward then a blast sends them flying to walls. Outside the Dark Sparkle is launched into space]
Shockwave: Lord Megatron!
Optimus Prime: Autobots, we must get to Equestria to warn Twilight about the Dark Sparkle. I fear its terrible presence will be detected there.