"Strategy" Starts, from Sonic Adventure 2

https://www.youtube.com/watch?v=hkBwLjLvwj4

"Hey Rookie." Sonic said as he and Buddy are headed to Green Hill. "Thanks for the help in the Death Egg, i owe you one."

Buddy nodded as they both reach the end of the city and the beggining of Green Hill zone. First, they have to get past Lost Valley to get in Arsenal Pyramid.

"Looks like it's straight ahead, Buddy, let's get going." Sonic grabs a wisp capusle then boosts off to Arsenal Pryamid. Buddy uses his grapiling hook to catch up to Sonic, which he is already half way to the pryamid.

"Looks like your catching up kid, i like your speed!" Sonic said as he looks at Buddy and then what's straight of him. "Let's Go!"

***

After a few minutes of boosting, Sonic and Buddy reaches the beggining of Arsenal Pyramid. Knuckles, turns on the Radio to make contact to the two.

"The enemy's factory is inside the pyramid." Knuckles said as he gather some troops. "I can send reinforcements if you don't think you can handle it.

"No need!" Sonic said as he boosts through some Egg Pawns. "The two of us are more than enough. We'll blitz the place and open up a path for the resistance. Right, partner?"

The two grind through robots then reaches the beggining to get up the pyramid, which is a long path full of robots, which also will be a challenge, but they both have double boost. It will be pretty easy for them

"Double Boost" from Sonic Forces starts

https://www.youtube.com/watch?v=RLDhtM-ACAw

Together
We can show the world what we can do
You are next to me and im next to you
Pushing on through until the battle's won

"Yeah! That's how it's done!" Sonic said as they boosts up the ramp to the Pyramid. "We've got unstoppable speed and timing We've just have to keep this up!

No one's gonna give a thing to us
Into each other we put ou trust
Standing united, after the fight

***

While Sonic and the Rookie are attacking the Pryamid, Tails, Classic Sonic, & Knuckles are on their way to attack Eggman. Which during this alternative timeline, Infinite is not there.

"Where is that infinite...... Ah, yes, he's fighting Silver right now." Eggman said as he looks around. "I also need to know where's the pesky Shadow!"

"EGGMAN!" Classic Sonic said as he starts attacking.

"WHAT? You, i though you went back with your little fox friend!" Eggman growls. "Prepare to die! The old classic ball in chain!"

"This is the action i was waiting for Egghead!" Classic Sonic said as he runs after Eggman and the Egg Dragoon.

"Such power exceeds even MY expections. Hah!" Eggman said as the ball in chain starts to become a saw. "My own genuis scares me sometimes!"

"But that means you miscalculated." Tails said as he turns on the radio to speak to Classic Sonic and Eggman. "That's a faliue in my book."

"Heh, good one Tails." Classic Sonic said as he dodges the ball in saw.

"Maw-haha! To surpass expectations is the ultimate of genuis!" Eggman said as he starts getting attacked from Classic Sonic. "I wouldn't expect you to understand. ALSO! Watch it you little....."

After a few seconds, the ball in saw as failed and Eggman starts getting angry. Then suddenly Eggman summons the Egg Dragoon MK 2.

"Oh no, this is bad! I saw my older self deal with this one, but me?! Really?!" Classic Sonic said as he looks up.

"Well this is going to be a hectic battle between them both." said Classic Knuckles as he looks up as well.

"You've got a lot of nerve for a pint-sized Sonic from another dimension!" Eggman said as he starts getting hit for the metal balls. "Still, this Egg Dragoon has only lost 10% of it's combat strength."

"You're lying." Tails said as he looks at Eggman.

"Timeline! From another Time, Eggman!" Classic Sonic said as he glares the Egg Dragoon.

"You won't have to wait long to find out." Eggman said as he acutally not lying. The Egg Dragoon is weaker then before after being used twice.

"Man, twice this piece of junk has been handeld with, now i have to finish it and destroy it." Classic Sonic said as he dodges the attacks and starts homing attacking the Egg Dragoon.

Finally the Egg Dragoon is loseing it's power, Classic Sonic, Classic Knuckles, and Tails have defeated Eggman but just not fully yet.

"Hmph! It wouldn't be a challenge to crush you here, any- WHAT?" Eggman said as he looks at the control panel. "RETREAT! EJECT!"

KABOOM!

As Eggman safetly escaped, the big Kaboom can be heard from Arsenal Pyramid. Sonic and Buddy have finished the act then they heard the sound.

"Huh, you heard that Rookie?" Sonic said the to Buddy. "Looks like we found Eggman finally!"

"What's going on? We heard the sound as far away from Headquaters!" Knuckles said as he turns on the radio. "I see four life forms from the radar from the location, you two have to go check it out!"

"The first day back, and i'm already going to defeat Eggman?!" Sonic said as he and Buddy boosted out of the Pyramid. "Sweet! Now i can get my revenge. Rookie, let's get going!"

"DOUBLE BOOST!"

Back in Equestria, Classic Tails and Twilight are on their way to Canterlot after a little problem of which way Tails was going. But behind them is Rumble and Button spying along with Sweetie Belle and Apple Bloom.

"You sure about this Rumble?" Sweetie Belle said. "We are going to miss class if we get to Canterlot in the morning!"

"Well at least this isn't a stupid descsion like i did back at the Cutie Mark Day Camp!" Rumble said. "And geez, it's been a month and we are still talking about it."

"I agree...... Hmmmm, that fox, seems like....." Button said as he looks at his Joyboy. "Custom Character, Uganda Forces...... Nope, i don't know where he is from."

"What about Ponynite, that has some characters like him." Rumble suggested.

"I don't have that game right now, i gave mine to Shady!" Button said as he looks at Rumble.

"Let's hurry! We're loseing sight of them!" Apple Bloom said as she takes off along with Sweetie Belle.

"Let's race?" said Button.

"Sure, why not!" Rumble said. "But i'm going to win!"

***

Back up in the sky, Tails and Twilight are almost to Canterlot, which is a few miles away.

"So..... your a genuis are you?" said Twilight as she looks at Tails.

"Oh yeah! I know how to fix a plane, do Math and all sorts of stuff!" Tails said as he smiles. "Mostly i like science....."

"Wait, we're here!" Twilight said. "Follow me, it's a large castle. I'll show you the back entrance!"

"Back entrance.... Alright!" Tails said as he and the plane follow Twilight down to Canterlot.

After a few minutes of explaining of the portal, Twilight takes off the Book where Sunset Shimmer usually sends her messages.

"Put the gem on top, and the Portal will open!" Twilight said as she grins.

"Wait...... if i'm going to put the Chaos Emerald there, then it won't come back with me....." Tails said as he looks at the blue Chaos Emerald. "Wait, unless!"

***

Classic Tails has a flashback during the events of Generations. This older self gives him the fake yellow emerald which helped Modern Sonic escaped from being destroyed in the capsule way back in the Space coloney ark.

"Look, i'm giving this emerald to you incase of any emergency in the future!" Modern Tails said. "One thing i should tell you is that in the next few years, you and Sonic will be going to the Space Coloney Ark. Tell Sonic to not go in a capusle circle shape area. I'm telling you this because i programmed the Emerald for where ever Sonic is, you will teleport and go with him!"

"Huh? Thanks Me!" Classic Tails said as he grabs the fake yellow chaos emerald. "I'll keep it incase of an emergency!"

"Alright, now let's wait for the two Sonic's to finish Planet Wisp!" Modern Tails said.

***

"Uhhh, Hello?" Twilight said as she looks at Tails staring at nothing but the portal.

"Wait what?" Tails shake his head. "I know what to do!"

Tails pulls out the Fake Chaos Emerald then puts it on top of the portal. Then suddenly a large flash comes about then Boom! The portal opens to Future Mobuis.

"Well, this is goodbye!" Twilight said. "Save travels to Mobuis!"

"Thanks Twi-" Tails stopped for a bit as he see's an attack going outside of the Castle. "EGGMAN! I FORGOT ABOUT HIM!"

Sirens start to ring across Canterlot

https://www.youtube.com/watch?v=R1z02IzI0WU

Also suddenly, while Twilight and Tails are not looking, Rumble, Button, Sweetie Belle, Apple Bloom, and Scootaloo made it their way to the top of the castle, then the 5 entered the portal with a small radio.

"Shhhh, be quiet you four and let's en-" Rumble didn't finished his scentence as he entered the portal.

The small radio leads to Shady's Photography shop to make contact together. Classic Eggman is attacking Canterlot with a whole pack of Robots. What will Tails do, escape to Mobuis or help the ponies to Equestria?! Future Mobuis is still in Modern Eggman's control. What will the Resistance do to defeat Eggman now that Sonic is with them now?

"Rookie! Keep going! We can do it and make it where Eggman is!" Sonic said as he and Buddy Double Boosts through robots and animals.

Author's Note

And! That is it for the end of the Chapter "Eggy"! The next Chapter will focus more on Equestria and the arrival of the foals. Also will focus a lot more on the resistance.

Also i hope you like the Cliffhanger at the end!