I have a couple of ideas on how to streamline the system...
One week before the testing period ends, ask people to make an "Individual Discussion Thread" regarding the Pokemon they believe are suspects. Close the threads which don't have enough substance to go on (if someone nominates Venusaur with the justification that "sleep powder is broken" or something). Let discussion occur, and if the discussion seems to suggest that the Pokemon in question isn't much of a suspect, then that Pokemon is not nominated. If the discussion is contentious, then the Pokemon probably is a suspect. At this point, go through the thread, pick out the people who made the most valid arguments for/against the suspect, and give them voting rights.
The advantage of this system is that it hides the nomination process and the voter paragraph process behind the general discussion and debate about a suspect Pokemon that goes on anyway, so it's much more seamless, less time consuming, and more "natural". The disadvantage is that it's much more subjective, and would probably involve more work on the part of the mods in charge of it.