The pic above is Lysandre's fused form.
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The thing that makes you most happy are the people that believe in you
~BB
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Ash's P.O.V.

I thought that it will be hard, but now, I don't know if I can win. The aura he emits is strong, too strong. I am stronger than my Oozaru form but I don't know if that's enough. But I'll fight. Even if it takes my own life, I'll save everyone.

"I am with you, master" I heard lucario's voice echo in my mind

"I know you are and I am grateful for that but we will need more power. He's too strong for us at this moment" I said out loud so that my pokemon friends can hear it too. I don't know what to do now, but I know what I was chosen to do. I'll protect everyone.

"Infernape, bring Serena back! Take pikachu with you! Greninja, I am gonna fuse with you! Then pikachu can use z-moves with you! Keep everyone safe! And yeah, thank you all for supporting me. All my friends, humans and pokemons, you were there for me when I needed you the most. The last thing I wanna do is leaving you all behind but if it means saving you, then goodbye. If I don't come back, tell Serena that I loved her till my death and after it" I said while giving greninja my z-ring. I smiled for what is probably the last time and a tear escaped from my eye.

(Just the clothes are different in the pic)

They all ran towards me. Tears escaped from their eyes. But I didn't have time to even hug them for one last time as he approached me faster than them. As soon as he touched me, I teleported us to the place where we trained. But before the final battle starts, it's time to complete the plan. I fused with greninja and then contacted Arceus through aura.

'Arceus, if I die, erase memories of me from everyone's mind. I don't want them to feel the pain of losing someone. Make Serena the queen of Kanto' as soon as I said that, I heard laughter of Lysandre and he said "You wanna save people who never did anything for you? You don't know what a weak creature human body has made you. I'll show you the real power"

His body started to change colour. He yelled and laughed in pain. He's releasing his true form. He don't only have a devil's voice, but a body too. His skin looked burnt and black aura released from him. It had white glitter like material in it. Let me rephrase it, his human part was glowing like white glitter in it. He looked somewhat like... me?

"You know what I did with that girlfriend of yours? I ordered my guards to give her pleasure in every way possible and then kill her! But she somehow beats those losers easily! Let's see how long she can do that!" he said as his body turned green and his hair white.

'Serena?! He did what?!?! I can't let him do anything to her! Pikachu and infernape! Please reach her fast!"

Anger boiled up in my body and I felt like I unlocked something within me. My body glowed red. This time, my aura was like fire, like infernape's fire. I heard the voice of pokemon god "Your wish will be granted but this is the last thing I can do for you, chosen one. You will be erased from people's memories but only if he dies with you."

"Thanks Arceus" "The battle starts now" I said as I returned to my human form fully. The only change was that lucario was still there in me and my eyes, hair and aura were red. My clothes changed and my power increased to a level which I thought to be impossible.

OK readers! I've rewritten the chapter! Hope you liked it! Super small chapter but I'll write a full aura battle!!! A few more things to be revealed but till then, tell me whether write a ending or a sequel that'll take us to the present time!

BB out!!!