Certainly. This thread is meant for discussion, albeit it had transformed into a fanart thread. :P A topic of discussion is appreciated.
There are humorous art designs in every CAP, though with the records for CAP designs so far, having a design based off of humor primarily tends to get overshadowed by 'cooler' designs. Voodoom, for instance, is rather witty by using a sewing needle as a lightning rod, to fit the CAP's ability, while having the design as a whole work off of Dark/Fighting. Krilowatt and Mollux subvert this trend by playing for cute instead, and you could argue that a shrimp learning how to fire Draco Meteors (at least, it once could) provides unexpected humor. From the outside, though, Smogon does have a reputation for being serious, so explicit silliness may end up less preferred. In terms of art, some voters just look for a cool, cute, and/or funny design that fits Pokemon, and others see how a design portrays typings, abilities, and stats before subjective decisions. Each voter has his or her own preference.
Wordplay and allusions are more prevalent in name and flavor polls, after the design of the CAP had been decided. Pokemon names are naturally portmanteaux, so the names that mesh and portray the pokemon the best are favored. Pokedex entries allow people to add their bits of humor without it having any competitively disapproving perceptions. However, there exists a line between antics and subtlety, as Aurumoth had shown, that reflects upon the CAP community.