Ash vs Mother Beast Lusamine

This is required by TXbonnieXae who want a story about Ash and Greninja vs Mother Beast Lusamine. This is a short story but hope is good.

Ash is about to going the next round of final battle. Then all the sudden his Pikachu getting pulled by a wormhole. Ash ran him and try to grab him, but he fell into the wormhole.

Ash find himself somewhere is not normal. The place look like out space and have these weird Pokemon. He walk around, try find a way out, then he saw a boy and girl about his age. The boy is battling a woman inside the same Pokemon he see everywhere. The boy look he having a hard time battle her Pokemon, so Ash come in the fight. He throw his Greninja at the woman.
"Who are you" the boy ask.
"I'm Ash Ketchum, I'm going to be the Pokemon master and here to help you" Ash said.
Ash tell his Greninja to use cut, but it's miss. The woman attack his Greninja and Greninja fell to the ground.
"You not going to Lusamine like that" the boy told Ash.
"But I will bet her" Ash told him. Then him and his Greninja use battle bond and became Ash Greninja.
"Alright Greninja, use water shuriken" he commended. Greninja hits Lusamine 10 time and then use cut at her.
"Yes we bet her" Ash yell happily. But she not done yet. Ash realize it and give Greninja one more command and take her down.
After that Lusamine is separate from Nihilego, a girl ran up to her.
"Man I don't know care for her" Ash said. Then he start to disappear with his Pokemon.

Ash was back at Kalos Pokemon League and his friends was looking for me.
"Ash!" Said Serena who run up to him.
"We were worried about you" said Clement.
"Well I been..." Ash try find a way to say it.
"Hurry up you going to be late" Bonnie said.
"Oh ya I need to the final round now" Ash said and run to the battle field.