Hmm, I'm not paying much attention on Goodra and Cresselia, so I didn't know they are part of the lower tiers. I honestly thought they are from the OU tier. :o
I nearly snorted at the poor IV and EV trained thing. Nah, I don't have any bad meaning! XD I haven't thought at the direction of low IV and stuff as I was too amazed with the mighty Vileplume.
Chlorophyll doubles the base 55 Speed of Vileplume and that is 110, as fast as a M-Metagross and M-Diancie. While a 110 S. Atk isn't too shabby. (: I guess a Technician powered up Bullet Punch/faster (and hard hittting) Pokemon like Talonflame and M-Blaziken is able to kill the mighty flower. Now I see the reason for nerfing the weather related Abilities. @_@
I'd like to try that Vileplume someday, but I know I'm not skillful enough to do so. I think you can pull it off, you sound like a great battler yourself. Lol