Will Synchronize's secondary effect of passing on the nature of the user to a wild pokemon work on generation V's roaming legendaries (Tornadus and Thundurus)? Or does it not work on them, like the roaming legendaries in generation IV?

No, it won't, since the natures of the roaming legends is decided when you first start a new game. Johnny B Guud 18:22, April 16, 2011 (UTC)