How do you unlock ricky the dragon steamboat on WWE SvR 2011?

You have to complete all the challenge matches in Chris Jericho's Road To WrestleMania, and then, at WrestleMania before you face Triple H, go to the green room and find Ricky "The Dragon" Steamboat.

All the challenge matches on Chris Jericho's RTWM:

Week 1 - Singles Match: The Miz

Week 5 - Singles Match: Santino (talk to Santino at the Royal Rumble to set this up)

Week 7 - Parking Lot: Cena

Week 8 - Diva Match: Maryse vs Beth

Week 11 - Singles Match: Santino vs Big Show (talk to Santino in the hall to set up your interference)

WrestleMania - Singles Match: FindSteamboat in the Green Room