When you knock out a roaming Pokemon, it will faint and then start roaming again, but with its health at full.
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If you knock out Azelf in Pokemon Diamond, Azelf will be gone forever (unless you have saved before battling Azelf and shut off the game and turn it back on to try again).
He dies you cant get it no more. get a life<---This guy's mom needs to get a life The true answer: It dies BUT you can get it back what you simply need to do is... GET A LIFE (joking), beat the elite 4 again and go back to where you found it (Works for every Pokemon like lugia, sudowoodo, snorlax, whatever except roaming Pokemon also suicune will be found under the burned tower instead of Culerean cape)
I'm pretty sure they go away permanently if you kill ANY type of legendary pokemon. well when i killed tornadus a few days later it came back
Roaming pokemon like entei raikou are everywere,just chec your pokegear.
it shows roaming Pokemon