Can you get Tornadus/Thundurus again if you beat them the first time?

Question

Will the two weather pokemon (Thundurus/Tornadus) come back if you defeat them.

Answer 1

I believe if you faint them you have to beat the elite four again for them to come back

Comments

This is the only right one... you have to beat the elite 4 again  or finish the main story for them to reappear.

Answer 2

u can catch them again

Answer 3

If you kill them i think not but if you run or they flee you find them again.So be careful and DONT KILL THEM,if you reallly want them.Have an good Mudkip ^_^ :)