Originally Posted by Fat ScraftyIsTheBest
SubSeed is a joke. Sure, it can annoy the odd shitty PS Ladder Kid once in a blue moon, but it's shut down by practically any Grass-type, which we have Venusaur and Ferrothorn. Also, Alakazam and Reuniclus don't give a fuck due to Magic Guard, and Espeon and Xatu can bounce it back. It's a horrible gimmick Pokemon who has no place on any serious team. And did I not mention that Tornadus-T sends Whimsy running for its money?
Whimsicott isn't good in OU because of sub seed.. although the guy you quoted may be thinking of her wrong.
She's good in OU because you can easily combine 2+ choice pokemon with her as basically nothing short of weavile (and dragonite/lucario if whimsicott is low hp) can set-up in front of a whimsicott... FYI max speed breloom, scizor and conkeldurr all fail to outspeed whimsicott.
She used to be OU but has unfortunately become one of those pokemon that have since been forgotten (like virizion and mienshao which i almost never see in OU now). The power creep hasn't helped her cause either, despite rain being the premičre, its hard for whimsicott to find a way in against most teams.
Whimsicott is good in OU for a few reasons:
-Forces switches, great for teams who stack hazards
-Deals with set-up attempts on choiced attacks, great partner for choice pokemon
-has access to a selection of priority moves AND u turn, making her a great headache/momentum grabber.
-priority tailwind combines nicely with pokemon like banded haxorus/salamence/kyurem-b and other hard hitters that are difficult to switch into (things like +2 nidoking/heatran sound good in theory but are easy to play around with clever switching)
above is a replay on one of my alts, watch as whimsicott basically manhandles a sun team without even using tailwind.