The 13th movie's title has been revealed to be Movie 13 Title Revealed: 劇場版ポケットモンスター　ダイヤモンド＆パール　幻影の覇者Ｚ, which translates to "The Ruler of Illusion: Z" (PokéBeach), "Phantom Champion Z" (Serebii), "Champion of Illusion Z" (my own translation).

A Japanese trailer has revealed the title, along with the three legendary beasts (Entei, Raikou, and Suicune) and Celebi. Speculation on the two sources below state that Z could possibly refer to a heretofore unknown Pokémon whose name starts with Z.

(It sounds almost like Dragon Ball Z to me.)

That's right

I knew they wouldn't run out of ideas for legendaries.

It also has all Gen II legendaries.

Z is the creator of illusion I believe so it might be evil Ash.

You can see the trailer in better quality here on filb.de http://www.filb.de/

Reposting this, because the Thought Police are on the move

And don't forget Zero from Giratina & The Sky Warrior, who was a number.

Maybe Ash develops powers that are (dare I say it?) OOOOOOOOOOOOOVVVVVVVVEEEEEEEEEEERRRRRRR NIIIIIIIIIIIIIIIIEEEEEEENNNNNNNNNN TTTTTTTHHHHHHHOOOOOOOOOUUUUUUUUUUSSSSSSSSSSSSAAAAA AAAAAAAAANNNNNNDDDDDDD!!!!!!!!!!!!

*PokeDex crushes in Brock's hands*

Dawn: WHAT?! NIEN THOUSAND?!

Evil Ash scares me.

Don't know if anyone has noticed, but besides Ash, they're going with a new artwork direction. More detail on our three legendary dogs (look almost like TCG versions with high detail).

Because of this, I'm theorizing this to be the last Pokemon movie. They're going to go out with a bang probably and tie everything together for Ash and the story of Pokemon.

What more can they do? We've already dealt with God (Arceus) for peaks sake! There's not much we can do but finish up the series.

I don't like saying this, but it's what I think. It's such a small preview and my idea might not mean anything, but if anything Z is a possible evil Pokemon that has been watching Ash through his entire journey and is the accumulation of all his experiences.

If the Pokemon is new however, this could be infinitely epic. If not, I'm assuming it's some Pokemon we don't remember but have met in the past in the series.

I think that 'Z' is Evil Ash.

I have no idea what is happening with future generations, but if this movie doesn't contain any new Pokémon, it's doubtful we'll receive anything in 2010. I have no idea just what they're planning to do with the movies, either because, as Jack mentioned, they already have God.

I just hope this movie turns out to be as good as it looks right now.

Lolno pokemon ain't gonna end. My guess is Arceus will remain the strongest pokemon, and that legends won't be as strong as arceus but instead be related to him in some way to extend the plot. As for the movie...olol evil ash. :V

What if Z is for Porygon-Z!!! Just a thought heh. I really do hope they don't butcher pokemon in gen. 5. I agree that they can just make weaker legends. I sure hope they do. Anyway, I am really looking forward to this upcoming year.

The trailer itself brings some interesting ideas into play, however. In the trailer, the pools of "green energy" are stated to be "ripples of time", which I`m assuming is a new concept of time travel for Celebi which they`ve developed, perhaps based off of the Mystery Dungeon games. Anyway, at te end of the trailer, it shows Celebi emerging from one in a present-day city saying "At that moment/But then, Celebi has seen the future!", implying that it may be trying to alter the course of history.

Now, my personal theory is that Ho-Oh and Lugia will still be involved. Given that the Legendary Beasts seem to be taking action in the future (in the trailer), it could be possible Ho-Oh is as well, and they are gathering to assist it. The teaser trailer showed Lugia and Ho-Oh battling, and while I doubt they actually would battle just like that, it gives the possibility of the same thing happening for Lugia and it`s trio. Either way, I`m still going to assume Ho-Oh and Lugia will be in the movie. Hopefully we`ll know y next month`s Coro Coro. And I`m personally hoping for a new Pokémon as well

They're playing the evil clone cliche a bit too late, in my opinion. They should have played it in the Arceus movie arc. But, better late than never.