Oh, we must remember the days of Chansey/Blissey.
In 1st gen, Chansey was a veritable Special machine of destruction, and a tank.
Then 2nd gen rolled around, it became Blissey, and Special was split, but it remained the Special tank.
In 3rd gen it remained the same as 2nd, mostly.
With 4th gen and its Special fighting moves and variety of mixed attackers, but it still held the line!
But now we must look at the new move, Psycho Shock. It attacks with Sp. Attack, but hits Defense. And as a TM, any Special attacker worth its salt has it now; from Alakazam to Ninetales, Togekiss to Starmie, everything will be killing this poor Special tank we all know and love.
So how will moves like this, and new pokemon and their abilities change the metagame? This is an open-ended discussion on the subject, so feel free to bring up anything (and yes, we have all heard of Drizzle Politoed, Drought Ninetales, and Speed-Boost Blaziken). Also discuss the viability of new pokemon and how some will linger behind, and some will come forward into the OU wonder.