Alright, who doesn't love a really good Pokemon piece every once in a while? Especially of the legends. Overall this piece has a very nice composition and I can tell that you took a lot of time on this piece. All of the Pokemon stand out very well against the background which is nice. Also the background itself is really nice looking and only adds a positive feature to this deviation. Though... one thing that I am confused about is the placement on Lucario. Lucario isn't a legendary Pokemon, although he has what it takes if you me . So that kinda confuses me a little... but it is really awesome to see Lucario in any picture.

Alright, one of the few things that I noticed, when I saw this image as a thumbnail, was that there was a lot of blue in general. Between Latios, Suicune, Manaphy, Lucario, and parts of Lugia, there's a lot of blue in one area. It took my eyes away from Latias and Jirachi. However, adding Mew and Celebi helps to even it out a little. My advice, would be to be a watch placement of characters a little more, and try to create an even balance, so that a persons eye's aren't directed at only one part. Though I'll admit it'd be difficult because of how you can't change a Pokemon's colors (unless you draw shiny ones).

Really the only thing technical that I see is that Lugia's wing is drawn a little shakily. It's not really noticeable, I had to really look for it to find it. But other than that this is a very well drawn deviation and the characters are nice. And as I said, its always awesome seeing a Lucario is any deviation. I can tell that you spent a lot of time on this deviation, and it paid off. Keep up the awesome work in the future.

Like I said before, I simply ADORE this picture. The poses are all nice, and pokemon obviously are drawn wonderfully in your style.
And the background is also very nice, it's decorative, yet doesn't take away from the focas of the characters!~ <3
-prods previous comment instead of rewriting it all-

Lugia's wing though, if I may say, the lineart looks a little shakey. All the other curved lines on the other pokemon look very straight(for a curved line LOL i can't think of a better way to describe that D; ) compared to it, and the wing just looked a little out of place.
Also, another thing I noticed is how some parts you did two shading colours, and others you did only one. You're going to want to stick to one or the other. Like latios' shading is kinda funky-- the back part of it has two layers, while the front has only one. I understand the demensions of lighting, but each side will get the same amount of light. ( I might be wrong, but I thought mine-as-well throw that in)
one more final thing, keep an eye at your light source. I /honostly/ can't tell where the lighting is coming from. You change the shading direction with every character( just small direction changes, but still noticable )

But this is awesome slgjxoidjgsd by FAR your best work yet ;D