I actually believe Grey Walrus. I'm Meganium, and when I targeted them last night, I instead received information on Infernobat., (funnily enough, a failed investigation, which seems to point to the fact that Inferno is also telling the truth).
I'm going to hold my vote for now, since no one else seems particularly shady, but I would like to ask those who voted for Infernobat. and Grey Walrus to consider my information.