It's on the island in the middle of Lake Valor.
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).
Any Pokemon (includingWailord and Azelf).
In Valor Lakefront
nope
No, NO LEGENDARIES EVOLVE.
The Legendary Pokemon in Diamond are Dialga, Azelf, Mesprit, and Uxie. That's all I know of.
You can't catch Azelf in Pokemon Heart Gold. Sorry! But you can catch it in Diamond, Pearl or Platinum. Hope this helps!
they are mespirt, azelf, uxie, and dialga
yes
it is very hard to get azelf and mesprit and uxie. in my Pokemon diamond, azelf and mesprit fled the battle. if you want to find them, use your matching Pokemon app on your watch and DO NOT FLY UNDER ANY CONDITIONS. IF YOU FLY, THE POKEMON WILL ALSO FLY AND YOU WILL NEVER FIND THEM. DO NOT LOSE HOPE!!
uxie azelf dialga, mespirite, girantina and heetran
There are no 'Grand Lakes' in Pokemon Diamond and Pearl, but there are the three lakes that have Uxie, Mespirit and Azelf.