EXT. N'S CASTLE - ROOF - CONTINUOUS
Hilbert turns to Iris, Cheren, Bianca, and the Elite Four members and the Pokémon...

HILBERT
Please leave. Get everyone out of here!

IRIS
We're not leaving without you.

CHEREN
None of us are.

BIANCA
Nope.

Hilbert sighs - he pulls out the HEAL BALL he received in NIMBASA CITY. Throws it - and lets out a fully-healed MELOETTA. He caught her!

HILBERT (V.O.)
Yeah. That Heal Ball is totally girly, but I'm glad I kept it. It fully healed Meloetta when she decided she wanted to join my party. And it fits her, I guess. She's not exactly the most masculine Pokémon around. But whatever.

HILBERT (CONT'D)
Meloetta, sing them a little tune. Get them to listen to me, okay?

IRIS
Wait. Hilbert, don't you dare -

HILBERT
I want you to leave and I want you to take all of my Pokémon - and these Pokémon - with you.

Meloetta begins to sing. Iris stops suddenly. She, Cheren, and Bianca just look at each other -

And then they go down the stairs, followed by the Elite Four, the Champion ALDER, and all of the Pokémon around them, including Hilbert's own.

And then Hilbert looks to Meloetta.

HILBERT (CONT'D)
Go with them okay? Make sure they're safe.

Meloetta nods - she rushes after the group -

Leaving only Hilbert, N, Anthea, Concordia, Ghetsis, and Reshiram in the throne room as Reshiram completely decimates the room. Ghetsis is on his knees, he's crying out.

GHETSIS
You - You ruined EVERYTHING! I thought Mewtwo was an assassin. It was supposed to kill you!

MEWTWO (O.S.)
But my orders weren't to kill him.

Out of nowhere, MEWTWO materializes. Right in front of Ghetsis -

MEWTWO (CONT'D)
(beat)
My orders were to kill you.

Before Ghetsis can even respond, Mewtwo lifts a hand - and without even TOUCHING HIM - throws Ghetsis against a wall. SMACK! His back gives a SICKENING CRACK. Mewtwo moves his hand swiftly - and Ghetsis hits the wall on the other side.

He drops to the floor with a whimpering scream. Coughing up blood.

GHETSIS
You - you can't kill me. I created Team Plasma with my own hands. I AM PERFECTION! I AM A KING!

Mewtwo CREATES a PURPLE, SHIMMERING BLADE out of thin air and raises it.

MEWTWO (V.O.)
No. You are nothing.

A quick slash across Ghetsis's belly. A pool of blood forms and he gives a gasp -

Just as a giant piece of debris falls toward Ghetsis and Mewtwo. Mewtwo TELEPORTS to GOD KNOWS WHERE -

Leaving Hilbert, N, and his maidens alone. N looks on in horror - he doesn't know how to react. Hilbert picks N up, who limps along with Hilbert through the destruction.

HILBERT
C'mon, we're gonna get you out of here.

N
You have no Pokémon. You can't fly us out of here, you can't -

There's fire everywhere. And N's panicking. He takes a deep breath -

N (CONT'D)
You were stupid. You had an Archeops. It could've flew us out of here. You complete IDIOT...

N rushes out of Hilbert's arms and falls onto Ghetsis's dead body. Rifles through his belongings.

HILBERT
N, I'm sorry for your loss, but we need to get out of here...

N
(coldly)
Don't lie to me. Neither of us are sorry he's dead...

N gathers all of Ghetsis's Poké Balls. Sighs -

N (CONT'D)
But his Pokémon don't deserve the same fate as he does.

Hilbert nods. Respects that.

N (CONT'D)
And he's got our getaway ticket out of here.

N tosses a Poké Ball - letting out a HYDREIGON. Hydreigon is a large, three-headed black and purple dragon with large, black wings.

N climbs on Hydreigon's back. Anthea and Concordia grab his shoulders. And finally, N holds a hand out for Hilbert -

Hilbert takes it and climbs onto Hydreigon. The hydra flies them out of there through an opening in the collapsing roof...

EXT. N'S CASTLE - DAY
HAUNTINGLY BEAUTIFUL EXTERIOR SHOT of the castle being totally DESTROYED by RESHIRAM -

As HYDREIGON soars away, with HILBERT, N, ANTHEA, and CONCORDIA on its back.

HILBERT (V.O.)
So much had happened. So many had been lost. Even with so many questions still unanswered - like who sent Mewtwo to kill Ghetsis, and how Team Plasma managed to catch Meloetta, only one thing was on my mind - My friends. Did they get out? Did they survive?

Okay. Dark right?

Ghetsis's death at the hands of Mewtwo set up a few things:
A) A complete "goodbye" for N's character. Ghetsis is gone, he's realized the error of his ways, it's time to say goodbye and move on.
B) It hammers in the idea that Ghetsis hired Mewtwo from someone/somewhere else.
C) It also hammers in the idea that Mewtwo is a "heartless Pokemon designed to be an assassin", something Ghetsis stated earlier on.
D) Mewtwo murdering Ghetsis and the idea that it was a set-up to assassinate Ghetsis was definitely leading in to a sequel.

So stay tuned. Hopefully I didn't tick off anybody with the handling of Ghetsis and N's arc. I felt N's cold response to Ghetsis's death was basically "any other memories I had before are smashed to pieces after what he did to me." Sure, Ghetsis was his father and there was something there but after all of that betrayal, can anyone really blame him? Or it could truly be hatred seeping out and pouring out of N. Who knows. There's plenty left for interpretation when it comes to the Ghetsis/N relationship.

PS: There's Ghetsis's Hydreigon you asked for, CopperCrow lol. Sorry it wasn't in a big battling scene, but I'd imagine watching Hydreigon carry Hilbert, N and the maidens away as the castle is destroyed in the background would be a fantastic visual to see on the big screen. Iris does own a Deino so there's still potential that somewhere down the line, Hydreigon could have a bigger role... ;)