Time to give my own idea, based off an idea of Archie Comics.

Name: Metal Sonic
Designation: EGG_001.
Classification: Robotic Doppelganger Hedgehog.
Core: Swift.

Weaknesses: Water and Electric
Resistances: Time and Swift
Immunities: Wind

Energy: 100
Attack: 100.
Defense: 80.
Speed: 120.

Quotes:
Start: I am the real Sonic!
Taunt: You cannot defeat me!
Victory: Kneel before your Master!
Defeat: Why... can't i win?!

Signature Moves:
Homing Attack
Learned at level: Start.
Power: 30.
Accuracy: 100%
Speed: 4
Energy: 3
Target: Anyone in Opponent's Party.
Description: The user locks onto a foe and rams them at high speeds. This attack is homing and thus unlikely to miss!

Black Shield
Learned at level: 5
Power: 0
Accuracy 100%
Speed: 3
Energy: 6.
Target: Self.
Description: The user cloaks themself in a shield of darkness that raises their defense by 30%!

Chaos Control
Learned at level: 9.
Power: 20.
Accuracy: 80%.
Speed: 4
Energy: 3
Target: All foes.
Description: Using the power of a Chaos Emerald, the user warps time and space to attack the entire enemy team at once!

Light Speed Attack
Learned at Level: 12.
Power: 40.
Accuracy: 80%.
Speed: 5.
Energy: 5.
Target: Entire Opponent Party.
Description: The user gathers light energy inside them for one turn. In the next turn, they attack the entire opposing party at the speed of light!

Robot description: A Robotic Doppelganger of Sonic The Hedgehog created by Dr. Ivo Eggman Robotnik to be greater than Sonic in every way.

Arena name: Final Fortress
Primary Core: Swift.
Multipliers: Swift x2.0, Shadow x1.5, Impact x1.5, Wind x1.3, Copy x1.1,
Description: Eggman's fortress, located high in the sky, amongst the massive Egg Fleet. E-121 Phi robots are located amongst the many machines, ready to strike down intruders. In addition, Metal Sonic also roams this area, ready to destroy any pesky heroes who want to sneak in.

Mecha Support: E-121 Phi
Designation: E-121 (E-Series #121)
Class: Mass-produced Copy Gizoid.
Core: Copy

Weaknesses: Impact and Time
Resistances: Flame and Electric
Immunities: None.
Affinities: Copy

Energy: 50/70/90
Attack: 50/70/90
Defense: 50/70/90
Speed: 50/70/90.

Signature Moves:
Mimicry
Power: 0.
Accuracy: 100%
Speed: 1.
Target: Anyone in Opponent's Party.
Description: Upon use, the user copies one move from the target's moveset for this battle only. The data is not downloaded to the database.