I see the cause has support. So many silly Smogon haters here, but they're directing their anger at the wrong place. Besides, house rules have their place in any game and can be a lot of fun. But Showdown is lame fake battling with badly animated Pokemon knockoffs. Actually I don't really care about it's existence as much as I'd enjoy bathing in the sweet tears of everyone who would whine if it were shut down.
You DO realize that everything bar attacking animations and Gen 6 sprites were ripped Directly from the games themselves.
Which is enough to shut it down, using the images without the express written permission of Nintendo