As MEGAS is about to confront Magnanimous, he presses the button to release all of his mind controlled fighters to attack the robot.
Magnanimous: GET HER!
The fighters attack Sunset as she fights back, "similar of how Galahad handles with people in church in Kingsman". After the girls free Pinkie and Wallflower, they head into the control systems where Magnanimous is. When they burst though the door, Magnanimous was nowhere in sight.
RD: Where he go?
Twilight: I don't know. Let just find a way to get back to earth.
When Twilight touches the controls, it zaps her.
AJ: WHAT THE?!
Wallflower: You alright?
Twilight: I'm alright. It looks like Magnanimous has put security proof on those controls to keep intruders like us away.
Meanwhile, Sunset had finished alot of fighters in her way until only one left is gonna confront her. When she turns around to see her last opponent, it was Magnanimous in his Sonic Abominator Suit and wearing his sunglasses.
Maganimous: You want me Bacon angel? You got your wish.
Sunset glares at him as she pilots Megas to charge at him. Suddenly, Maganimous grabs his sonic bazooka to aim at his target.
Magnanimous: TIME TO GET, groovy.
He shoots his sonic bazooka at MEGAS, blasting it's arm off. He shoots more parts and limbs one by one. Then he blasted MEGAS into the walls and then collapse on the ground.
Twilight: SUNSET!
Magnanimous grabs a serious damaged Megas.
Magnanimous: COULD THIS BE MEGAS'S FINAL ROUND! LETS FIND OUT LADIES AND GENTLEMEN!
Fluttershy: WE HAVE TO DO SOMETHING!
Pinkie: On it!
Pinkie brought some musical instruments for the girls.
AJ: Pinkie! There's no time for playing music to... summon our magic to stop the bighead! Now I see your point Pinkie!
Wallflower: Where did you get those?
Pinkie: I store them in the robot's body for the winning party.
Wallflower: Right... I'll get Magnanimous attention.
Magnanimous is about to finish off Megas with Sunset in it.
Magnanimous: Hasta la vista Bacon Angel!
Wallflower: HEY!
The call from Wallflower, stop Magnanimous froming destroying Megas as he turns around and notices some girls on screen.
Pinkie Pie: One, two, three!
[The Rainbooms] There was a time we were apart But that's behind us now See how we've made a brand new start And the future's lookin' up, ah-oh, ah-oh And when you walk these halls You feel it everywhere Yeah, we're the Wondercolts forever, ah-oh, yeah! We are all together (Ah, ah, oh-oh-oh-oh) Now it's better than ever (Ah, ah, oh-oh-oh-oh) You can feel it, we are back (You... can... feel... it...) And I'm so glad that we're better Better than ever Whoa-oh, oh-whoa-oh Oh yeah, we're better than ever Whoa-oh, oh-whoa-oh
With Magnanimous distracted, Sunset manage to activate the chest cannon controls.
[Rainbow Dash] There was a time we couldn't see Past the differences
[Applejack] That separated you and me And it left us on our own
[Pinkie Pie] But now you walk these halls And friends are everywhere
Magnanimous: Aw please, just give it up!
Magnanimous was about to aim at them with his weapon, but then he notice Megas is launching his chest cannon at him. Magnanimous panics as he aims it to stop it until he was too late as the speakers from the chest cannon blast him away and destroying his sonic bazooka. The music had also destroy the mind controlled devices on every fighter in the arena as the crowd cheered for the girl's music.
[The Rainbooms] Yeah, we're the Wondercolts forever, ah-oh, yeah! We are all together (Ah, ah, oh-oh-oh-oh) Now it's better than ever (Ah, ah, oh-oh-oh-oh) Now that we are back on track (Now... that... we... are...) Yes, I'm so glad that we're better Better than ever Whoa-oh, oh-whoa-oh Oh yeah, we're better than ever Whoa-oh, oh-whoa-oh Oh yeah, we're better than ever Whoa-oh, oh-whoa-oh Oh yeah, we're better than ever!
The whole crowd cheers for the Equestria Girls as Magnanimous got out of his armor. Then a whole lot of angry fighters are confronting him for tricking them and controlling them.
Magnanimous: Hey guys... You like to get paid if you spare me and pretend this never happen.
Fighter: How about we'll do you one better.
One of them cracks his knuckles as they are prepared to beat him up. Later as the crowd and fighters are leaving the arena, the girls use the control systems to teleport themselves back to earth.
Twilight: There it is.
RD: Man this adventure was great but very exhausting.
Sunset: Tell me about it.
AJ: What were we thinking about trusting swindlers like him.
Rarity: Next time we rather not jump into conclusions that involves moon sized pile of treasures.
Pinkie: We're not gonna leave Megas here are we?
The girls looked at a brutal damaged mech lying on the ground after a brutal battle.
Sunset: Well even when he's in no shape of fighting anymore after the speakers and fighting alot of mind controlled robots and monsters. He still could be useful for other things.
Meanwhile on earth as the crusaders have just arrived to the junkyard.
Scootaloo: What do you girls think?
Sweetie: Uh did you say it was real or imaginary?
Apple Bloom: Yea, I don't see anything but mountains of junk here
Scootaloo: Wait what?! But it was right here! The girls must have taken it for a joy ride I think.
Apple Bloom: Joy ride, right...
Suddenly, a huge portal appeared above the sky as a damaged Megas fell into the junk as Apple Bloom and Sweetie Belle are surprised to see that.
Apple Bloom: Oooh. That robot.
Scootaloo: Told ya.
The mane group got out of Megas.
AJ: Apple Bloom!
Rarity: Sweetie Darling!
The big sisters joyfully hugged their little siblings.
Scootaloo: Hey Rainbow Dash. What happened to Megas here?
RD: Well we were accepted by wrestling champion tournament until things get way too rough. But Megas here is in no shape and there no way of fixing him. Sorry kiddo.
Scootaloo: Oh I see. But at least I'm glad all of you guys are alright.
Sunset: Yep. And we got some video footage if you girls are interested to watch.
At night after the girls decorated Megas into a sitting statue like posing display as they play a large outdoor screen projection to watch footage from the Galactic Wrestling Federation.
Scootaloo: This is amazing you guys!
Sunset: Thought you might say that.
Wallflower: You think this guy is okay of being like this for now on Sunset?
Sunset: I believe so Wallflower. I bet he's done with fighting like his previous owner. I mean change is okay and natural. But something that won't change. Staying in touch with you guys.
The whole group hugged after hearing that as they keep watching the videos on screen and Megas will live on as a legend like his owners, Coop.
THE END
Give credits for Brandon Vortex as he helped me with this story.