Hm... Well, I'll start with the Arceus images first. YAYAYAYAYAYAYAYAYAY! Thank you so much, WPM, for bringing those to us! It means so much to me!
Now, about the movie:
I literally cried a little during the intro when they're getting to the title (the one with all of the amazing animations in the Japanese version) - they tore it to crud in the English version, and I really hate them for that. :/
Gracidea is pronounced like Quesadilla, what the crud? The flowers sound like they come with yellow rice and black beans, for goodness sake.
I didn't like Land Forme's voice at first, but I got used to it. Could have been better.
Sky Forme's voice was okay, but nothing amazing.
Newton's voice was also okay, but nothing amazing.
Zero's voice was great, except for his laughs - I couldn't tell from the 5x Fast Forward oh-my-gosh-we're-Cartoon-Network-and-don't-care-about-all-the-effort-put-into-the-credits'-animation-let's-make-it-tiny credits, but I think Zero's voice actor was the same actor that did L Lawliet (sp?) from Death Note. At least that's just what I thought.
Them taking out death mentions from the film is just lame. Honestly, like WPM said, it's just another part of life, and the best part is, Giratina didn't die.