Don't Shuppet float though? I can't see Thyme floating, no m atter how hard I try. Hm... Maybe some green paint and you could disguise her as a different Snivy? Heck, that would be enough to throw Brian for a loop, espicially considering his snivy has bandages on the last time he saw her. XD
I'm thinking some kind of convincing disguise of another Pokemon. I was thinking of Shuppet since thats pretty much only a sheet :p There could be a few more options if I can think of any