There in Subspace beginning to break up but Tabuu notice he has one energy lefy before dying after seeing friendship, trust, and love begins to weakling him however one fighter he come across was Sonic when Sonic blast his wings he begins to weaking but he notice that one creature is powerful enough to take down all fighters by using their own moves against them as he sees a robot that looks like sonic. Metal Sonic. Using his last energy he call forth Metal Sonic who then becomes a trophy and then TAbuu place a timid badge on it and throws it to the world outside of the Subspace world then begins dissapearing never be seen again for all eternity. Hoping that Metal Sonic will achieve what Tabuu didn't.

It was a fine day as Mario prepares his battle against Kirby. As the announcer guy said start Kirby jumps in the air while other fighters watch.

The timid badge that was place on Metal sOnic trophy starts spinning as MEtal Sonic shook his head.

Meatl sonic: Where is this place?

HEaring a crowd roaring in the stadium nearby Metal Sonic flies over there.

Mario using his jumping skills to dodge Kirbys rapid attacks uses his fireball attacks but kirby, being a marshmellow like, puff up and float in the sky and sucking MArio inside then started spitting MArio out and uses Marios own fireball attacking scorching Mario.

Metal sonic was on top of the stadium looking and copying the data of MArio, and Kirby but he discarded the sucking powers due to not having a mouth of his own.

suddenly a Smash Ball appears Mario and Kirby is jumping to get to it and MArio managed to grab it and use his Final SMash... Final Strike. (I think thats it.) Sending Kirby out of the stage and becomes a trophy but MArio touch it and Kirby was revive.

Metal Sonic seeing many battles after that and coping everything he sees as Sonic was the only fighter who didn't battle but then luck have it he was fighting Mario as everyone getting off their seats and refills their drinks and popcorn.

Snake: Hey, whats going on here otacon?
Otacon: Well, I guess now I know why you didn't like Sonic.
Snake: What?
Otacon: Are you jealus?
Snake: ...
Otacon: i get it you wanna be Marios rival but here I let the Colonel tell you...
Colonel: Snake, I know how you feel but we first appear after sonic, you see sonic appear in 1991 since then hes been everyones favorite. For the first time ever Sonic and Mario compete each other. Now they fighting each other this is one spectacular battle I wish I was there but I had to stay here and monitered the situiation.
Snake: Huh! When can the two team up for teh first time?
Colonel: Not that I know of! But Snake heres a mission for you if you don't wanna do it.
Snake: Listeing!
Colonel: Theres a huge spike of energy thats far beyond anyhting that we have encountered and there is a huge strong manetic field and its magnitued is off the scale try to see if you see someone who you never encountered.
Snake: No one can't produce that strong scale.
Colonel: True be careful and watch the fight and then start your mision.
Snake: Roger!

but Snake wasn't the only one Fox and Falco too got a call from slippy as he too explains of a huge energy spike.

Fox: But thats impossible!
Falco: Could it be Wolf?
Fox: No, he right there!

Wolf was in the stands closing his eyes not caring who wins or losses. Samus on the other hand felt something thats like she never have felt beofre and that is fear. And Ganondorf too felt it too. His eyes were moving around trying to find who is making that energy spike that also includes Zelda who was with Peach on the stands.

Peach: Whats wrong?
Zelda: A powerful energy unlike anything I've felt for a long time as if a massive evil is here.

Sonic too felt it as his quills begins to shake.

Sonic: (The quills don't act that before since... Don't tell me hes here too?)

Sonic look around as AMrio gave a sliding kick sending Sonic off his feet. sonic, doestn' appear attention to the feeling prepares for battle Sonic begins running towards MArio and miss but jump and mananged to hit MArio but as the battle keeps coninueing Metal Sonic sends out lightning bolts in the sky as Soinc and MArio tries to get the SMash Ball instead teh ball got crush by the lightning bolt.

Snake: What the hell?
Nana: But the sky isn't dark who could...?

The smoke clears as Metal sonic was tehre standing between MArio and Sonic.

Sonic: So you are here. How long have you been here... Metal Sonic!
Fox: What did he say?
Falco: Metal sonic?

Wolf: Opens his eyes not knowing on what the hell is going on seeing Metal sonic looks at Sonic who then uses MArio finishing move. But instead hits Mario with it..

Snake: Otacon who the hell is that?
Otacon: Hmm, that Metal Sonic. Sonics robotic counterpart he was created to defeat Sonic as a matter of fact Metal sonic, at one time, betray his own creator he even proclaim himself as the Ultimate Overlord and says that hes the real Sonic and the Sonic that we know is nothing but and get this "his loathsome copy." He also said that he has nothing to fear and will become the worlds most supreme being. He has... wait its him.
Snake: Huh?
Otacon: MEtal sonic is the one who send out that huge spike.
Snake: SAy what?
Otacon: I know but he also has the power to combine others peoples data combine them with chaos data and becomes super strong.
Snake: I betcha he even has my abilities since he use MArios Final Smash.
OTacon: Just be careful Snake that robot has Sonics essicantal life data insdie of him he thinks, acts, and does like the real Sonic does.
Snake: Thanks for teh update.
Otacon: Did I mention he can transform his own body with his own hands.
Snake: Your joking!
Otacon: Its the truth!

Sonic watches as Mario becomes a trophy and Peach revives him.

Sonic: Just what do you think your doing here Metal sonic?
Metal Sonic: Would you like to know?

Metal Sonic flies into the air and begins attacking Sonic and Sonic dodge as part of the arena begins crumbling.

King Dedede: Holy dolly!
Meta Knight: Tahts some power.
Link: He must been far stronger then Tabuu.
Popo: I'm scared.
Ness: Sonic will cream him.

Metal sonic body begins glowing and shout out another move.

Metal sOnic: PK Starstorm.
Ness: Say what?

Bunch of meteors attacking as Metal Sonic able to control them tries to strike Sonic but  ran out of room.

Metal Sonic: I remember the first time you and I battle Sonc I had you on the run and you are on defense now heres my own Final Smash as you call it. Plasma Pulse.

A huge concentrated energy comes out of Metal sonics air intake and blasts Sonic out of the arena. But the alloys came out of nowhere and begins spawing as Metal Sonic dispatch them with ease with more the 15 minutes the alloys retreats as everyone else retreats and running and screaming.

Wolf: How... how can a fighter use someone else attacks.
Fox: Why are you telling me this?
Wolf: Since that thing is so tough know this this is only a temporalry allanince.
Falco: If thats gonna be then so be it.
Fox: I thought...
Falco: hey go out there and get myself cooked by that Metal Sonic fellow no way man game over.

King Dedede and Meta Knight too ran in fear as Kirby was being carried by Dedede.

King Dedede: No way, no way, no way.

(king dedede sings that you know "here we go... go... no way. that song.)

Samus, Pikachu, Lucario, and Snake are too running.

SAmus: Is that really him?
Snake: If your talking about the energy spike then yes.

It was a totally nightmare for everyone Metal Sonic standing there flies off to parts unknown.

At Peachs castle...

Bowser (Gasp)
Mario: Mama mia!
Luigi: Who would've known Bowser is tired.
Bowser Shut up plumbers.
Gannondorf: ...
Link: ...
Gannondorf: I don't whats bad being born evil, good, or not able to be born at all.
Link: Scared?
Gannondorf: Yes.

Lucas was looking around and notice that Sonic isn't here.

Lucas: Wheres Sonic?
R.O.B: Blasted.
Mario: This looks familiar I took got taken out but it was from a cannon.

Everyone looks around and sees no Sonic.

Lucario: That Metal sonic is powerful he blasted Sonic clearly out of the arena whats his power level.

R.O.B: Lets see Tabuu is only like somewhere in the hundreds or thousands but Metal Sonic right now more then ten thousand.

Everyone stood there having all their eyes wide open in fear and anxiety. But Lucas scared but then he got a call from Kumatora and told him to come and bring in Ness because Pokey has come back along with the Giygas.

Lucas: Ness...?
Ness: Yeah?
Lucas: Pokey, Giygas came back.
Ness: Lets go!

The two PSI kids left but Kirb saw them and follow them. Lucas and Ness tries to find out where they gonna do.

Kirby: Puyo!
Ness: Kirby!?

Kirby points his warp star and telling them that he can help out in finding Sonic.

Ness: You wanna help?
Kirby: Pu, Yo, yo, yo!
Lucas: Finding Sonic while helping us out?

Kirby nodded as Lucas, Ness, and Kirby flies toward Onett.

Outside of Onett Kutomora, Tintin, Ana, and other heroes of Mother games fight off the invading Giygas and Poky however a Sonic trophy landed near Tentin as he wonders who could it be but release Sonic.

Sonic: MAn, thats gotta hurt. Huh?

Giygas comes closer to Sonic as Sonic jumps using the spring as an extra jump and kicked it down to the ground killing it.

Sonic: First metal sonic now this!? Time to party.

After beating the Giygas their leader teams up with Poky.

Poky: Ha, you freaking little nerds you think you can beat me the Great King Poky?
Sonic: Um... don't you mean King porky?
Poky: Who the heck are you butt-head?
Sonic: None of your business pig.
???: But mine!

Metal sonic was there as he battles the leader of Giygas showing his powers as he uses PK StarStorm defeating him with just one attack.

Kumatora: How can he use that attack?
Poky: most importantly just use one attack? Who are you  tin can?
Metal Sonic: I am the Ultiamte Overlord the worlds most supreme being Metal Sonic the one true Sonic.