@Yilx - Nice artwork. However, if you plan for that to be your main design, you need to observe this submission requirement:
"Any 2D full color digital or traditional media may be used, so long as it contains a distinguishable outline on the subject in contrast to the background. 3D media are not allowed."
Your current rendering does not have a distinguishable outline. If that picture is intended to be part of your Supporting Material, then ignore this. With Supporting Material, just about any art form is acceptable. However, a Main Design has specific guidelines listed in the OP of this thread.
To all artists - The "outline rule" applies to most of the "glow effects" being used in other designs, and needs to be fixed for final submissions. I noticed CyzirVisheen pointed this out to one artist earlier, but it needs to be mentioned to everyone, since several people have been doing this sort of thing.
Also, while I'm discussing design guidelines, there were questions earlier about the following art rule, so I may as well take this opportunity to explain it in more detail.
"No props, action effects, move effects, or additional objects can be rendered on or around the pokemon. If a prop is part of the pokemon's basic design (ie Farfetch'd Stick), then it is acceptable. A basic rule of thumb is -- anything that would not be appropriate in a game sprite, should not be included in the Main Design."
The restriction on "move effects" is hard to define on some designs, but you generally know it when you see it. For example, the fire at the end of Charizard's tail is not considered a "move effect". However, if someone drew a design showing Charizard breathing a stream of fire out of its mouth -- that would be considered a move effect.
So, to use actual submissions in CAP 8 for examples --
Wyverii's design has sparks jumping between the horns on her pokemon. That would not be considered a move effect. Ditto for the spark on
my design's tail. Those are part of the pokemon's base design, much like the fire on the tails of Charizard or Magmar. Note that both Wyverii and I put distinguishable outlines around the edges of our sparks, to ensure it also conforms to the "outline rule" mentioned above.
I think the lightning shooting out of the fingertips of Cartoons' last picture, is probably a "move effect". However, I don't think that is Cartoons' final submission, since he normally makes lots of supporting art, move studies, and alternate poses for his designs. Even if it is intended to be his main design, the little sparks can be easily erased, and not significantly affect the overall impact of the picture. Cartoons has done many CAP designs, and is quite experienced in the community. I'm sure he'll have a legal design in his final submission. That's why I have not mentioned anything up until now. However, someone else pointed it out earlier, so I felt it deserved some explanation. So, to be clear -- do not make final submissions of pokemon shooting lightning bolts or any other overt move effects of that sort.
When "energy effects" become a bigger part of the pokemon designs (like some of the glow effects used in some CAP 8 designs) -- then it gets a bit harder to judge. In the game sprites, there are a few examples of pokemon that have "field effects" around their bodies. Koffing is surrounded with smoke, Gastly is enveloped in a ghostly haze, Moltres and Rapidash are both entombed in flame. So, many CAP artists like to wrap their designs in a "glow" of some sort.
I personally think it's a cheap artistic cliche, struggling to squeeze a little extra "coolness" into an otherwise bland design, so I usually roll my eyes a bit when I see it -- but that's just my personal artistic opinion. I've been accused of using cheap artistic cliches as well -- so "to each their own", I guess. As a matter of CAP artistic policy -- glow effects are perfectly legal, as long as they follow the aforementioned outline rule.
Unfortunately, many people that add glow effects to their designs, are typically just using a generic blur effect in their graphics program. Such graphic effects rarely conform to the outline rule. For this reason, many inexperienced CAP artists have mistakenly gotten the impression that glowing effects are against the rules. They are not. It just seems that way, because most people that add this kind of visual sugar to their images, are usually inexperienced CAP artists that have just discovered the Blur Tool in Photoshop and think it makes their design look "omgz kewl!!11". So they post their effect, and it is promptly deemed illegal. But, it's not the cheap glow effect that is illegal -- it's the inexact rendering of the glow effect that makes it illegal.
BTW, you can use blurry effects on the interior of your picture -- so long as the elements of your picture are surrounded by a distinguishable outline. If you don't understand how this statement is consistent with the previous statement -- then I suggest you avoid blurs and gradient effects altogether. Just draw lineart, and leave it at that. Many CAP voters prefer clean lineart anyway, so you'll probably be doing yourself a favor in the polls.