The thing is that quite a few of Gen IV and V fail the last criteria, in my opinion at least. I'm not saying that all Gen IV and V pokemon are bad (Bachuru~), but some are just too overloaded with little designs and/or look too similar to another unrelated pokemon.
Take, for example, Kuritaran.
I mean, just what in the world is this
thing? It's not an animal, nor a plant, nor a fish, or even an object; it's just a thing. It has too much
stuff all over its body. What are we supposed to be looking at? The stripes on its body? Its weird drill-like claws? Its pointy head? And just what is up with those brown strips all over its back?
Pandoraa, for example, is only trying to get across two things: its bright-pink poisonousness and its caterpillar-ness, which is accomplished by the segmented body and antennas. Ok, Pandoraa is a poisonous worm, we got this. But it's not a boring poisonous worm either; the antennas and tails are a nice touch, and it's a
fat, poisonous worm. I'm still a bit iffy on the purple color of the rings (I'd like them better if they have more contrast), but it cuts up the pink and spices up the design as a whole. Without the purple rings, Pandoraa would be a rather boring, fat, poisonous worm with too much pink.
Back to Kuritaran. The thing is that the yellow stripes on its front accomplish nothing. It draws attention away from the cooler parts of the design, such as the claws and the pipe-tail, and instead makes our eyes focus on the clown-like stripes. Maybe it's supposed to look like magma or something, but there's better ways of doing that than putting bright yellow stripes all over its body! I think the focus of Kuritaran should be on its claws, its strange body shape, and maybe its tail, and anything else is unnecessary; it's got enough details on those three parts to look interesting.
And the first thing I thought when I saw Wargle was "this pokemon looks like a digimon". Yes, it's made of awesome, but
doesn't it look like it could have evolved/digivolved from
Hawkmon?