after you defeat team galactic for good at spear pillar go to lake valor and surf to the cave in the middle. talk to azelf and you will battle. it is best to use a dark type poke mon because they are immune to azelfs psychic attacks. use false swipe if you have it or use bug ghost dark attacks to take most of its health then use fighting psychic moves which aren't effective to get it to red in its hp bar. give it a status condition and use ultra balls. you can also use your master ball but you may want to save it for the elusive mesprit.
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Darkrai has the catch rate of maybe the lake pokemon( Azelf, Uxie, and Mesprit) seperate.
They will run away, and you have to find them in the wild and capture them.
you can't catch a ditto on Pokemon pearl or dimond but you can migrate from fire red or emerald
turn back cave(after u beat the eleat 4 )
You can't catch Azelf in Pokemon Heart Gold. Sorry! But you can catch it in Diamond, Pearl or Platinum. Hope this helps!
azelf is at route 23
Dialga
i know you can catch a ditto
luck
catch or defeat palkia and go to lake valor and you Will find azelf
nope
you have to go to lake verity cavern and catch it.
You can't catch one.It can only be caught in Pokemon Pearl and Diamond
Azelf is found in the Sinnoh Region, in one of the three caves in the middle of the three lakes. (Pokemon Diamond and Pearl). You can catch azelf after you catch the Pokemon Dialga or Palkia. It depends on the type of Pokemon game you have Pearl for Palkia and Diamond for Dialga.It would be best to catch Azelf with an Ultra ball. But if you havent used your master ball yet u can catch Azelf with that. Use Kricketune's false swipe, the use luxray's thunderwave to paralyze it. It took about 10 dusk balls.
pee wee Herman
you need a action replay