The battle started and Mario brought out Entei and Sonic brought out Suicune.

"Use flame wheel!",Mario said.

Entei responds to his command by blasting a wheel  of fire towards Suicune but it leaped to the side in time to dodge it and used Aurora beam to counter. Suicune then used hydro pump but Entei used flamethrower to block the hydro pump. It was still struggling though to try and keep Suicune's hydro pump away from it. Mario saw it was starting to get a bit tired.

"Use overheat!"

Entei ran towards Suicune and used overheat but Suicune interupted it with waterfall stunning Entei and it fainted.

" Time to get serious",Mario thought then hurls his second pokeball releasing Sceptile.

"Use frenzy plant!"

Sceptile used frenzy plant and giant roots the size of a huge tree trunk emerge violently from the ground slamming Suicune with great force making it faint.

"That was just a warm up. Now I'm serious."Sonic said before throwing his second pokeball and Greninja comes out.

"Use Cut!"

Greninja runs at a really fast speed giving sceptile a serious cut. Sceptile flew back but it landed and got into its fighting stance, indicating that it's not giving up yet. It ran towards Greninja and used leaf blade however Greninja defended itself using  cut and it jumped backwards using double team creating several  copies of itself with each of the copies  with white blade on their arms about to use cut on their  grass type opponent. However Sceptile used frenzy plant destroying the copies and giving Greninja heavy damage. Greninja got up and used water shuriken, hurling it fast towards Sceptile but it blocked it and used bullet seed,Greninja dodged the attack and hurled another water shuriken quickly, Sceptile flung backwards and fell flat on its back against the ground due to the force. As soon as it got up, Greninja finished it with false swipe making Sceptile faint.

Mario brought out his Charizard.

" fire blast!"

The ready Charizard obeys its  first command by shooting a massive fireball which turns into an "X" shape towards Greninja .

"Quick!, block it with water shuriken!",Sonic said.

Greninja nods and quickly makes and throws a water shuriken towards the incoming fire blast which collided creating a huge explosion. As the smoke was clearing, Charizard flew quickly and used dragon claw but it was blocked by Greninja's "cut". Charizard used mega punch however Greninja swiftly moved to the left and catapulted Charizard with a strong hydro pump.

"Hmm...You're holding back aren't you?",Mario said.

"No",Sonic said lying.

"I know you're lying Sonic, you can't fool me". Time to heat things up. Mario then gives Charizard a mega stone and it transforms to the mighty "Mega Charizard X".

"I'm not holding back anymore so you shouldn't do so either. Lets -a -go!"

Mega Charizard X gets ready to battle as it looks at Greninja and Sonic.

"That's the spirit Mario!",Sonic said giving a thumbs up and a wink." I'm happy you're finally using your full strength. If its a battle you want, its a battle you'll get."

Sonic then did his special technique. The spirit fusion. Sonic and Greninja simultaneously raises their hands and stomped their foot onto the ground and did it. Their souls combined turning Greninja into a form known as "Sonic-Greninja".

Note: Sonic-Greninja resembles Ash-Greninja the only difference is it has blue quills instead.

Mega Charizard X uses fire blast spitting a huge blue fire ball which turns into an "X" shape towards Sonic-Greninja but it leaped high into the air dodging the attack and hurled 3 water shurikens at it rapidly.

"Block the attack with dragon claw".

Mega Charizard X obeys and uses dragon claw and a green energy claw  envelops in its hands. It then slashes the incoming  water shurikens quickly and violently. It then flies towards Sonic-Greninja to attack it but in Slow motion, Sonic-Greninja sidestepping to the right quickly and Blasted it with an enhanced hydro pump sending Mega Charizard X flying but it gets control of itself  but before it realized it saw  several copies of Sonic-Greninja  running towards it full speed and used an enhanced "cut"which was a white like sword which was 3 times its size and with full power, all the copies including the original gave Mega Charizard X a devastating slash which caused a massive explosion.

The dust soon clears revealing a normal Charizard lying on the floor with swirling eyes signifying that it has fainted. Sonic won.

"The winner is sonic!!",the announcer said through his microphone as the spectators roared in happiness for their winner.

Eleminated Trainers
-Mario

"You did well".Mario said as he helped his Charizard up. He then leaves the field.

Sonic also leaves with Greninja walking by his side.

"Now it's time for the battle between Goku and shadow."

Goku and Shadow soon enter the field to  start their battle.

"Now get ready...set....battle!!"