"Bye Greninja, hope you can come back." Those were the last words That Ash said to Greninja before heading back home to get a vacation to Aloha, which ended up being a new adventure.
"..."(You can go with him Greninja. He's you're trainer. Plus, I have another legendary Pokemon.) said Zygarde, due to him having a sensing skill and another legendary.
"Greninja!"('Yes! I get to be with my trainer! I will be able to get stronger!)
"Yay!" said Ash, understanding due to a power which will be revealed soon.
*timeskip*
After a bit of waiting, they got back to Pallet town. "MOOOM! I'M HERE!" Ash shouted out.
"Ash! You're finally back! Let's go on a vacation. You've been traveling a lot recently and I am getting really worried about your health." But what Ash didn't know was that Delia was going to apply him a school where he would have new adventures. But Greninja was going to make sure Ash would look the same when he was wearing clothes.
*another timeskip*
Ash and Greninja, along with Pikachu, races until Ash gets lost. (not gonna mention Litten because that would be awkward with my Ash. And he could just dodge Litten, you know.) Pikachu, being a mouse, smelled Delia and led the way. This is where Mallow comes and since the Author's too lazy to remember what she said , she says what she says
"Oh hi Ash, since you would want to have an adventure here, I am going to apply you to this school, because I don't want you to sleep in a sleeping bag in a tent, unless Serena is in there with you."
"Wait bu-"
"And you don't need to worry about not getting in because the Principle over here,"*points to Professor Oak*, "is Dr Oak's cousin."
*In Ash's mind-scape the principle and Dr Oak fuses* 'Well this school looks decent so I guess I would like it,' thought Ash.
Little did he know that he would soon be able to use Z-moves and mega evolutions.