Once unless you save before you battle him/her and you reset the game
if you mean seeing azelf without it going into your pokedex, 2 or 3. if you mean battling azelf withit going into your pokedex, twice. once when you first battle it in valor cave, and again when you have a rematch [after one week] if you defeated it the first time.p.s. yes, you can battle legendaries (in dpt) twice.
DONT!!!! if you run away from azelf or uxie, youll never battle them again.(unless you have a action replay) if they k.o. you, you can battle them again. if you k.o. them youll never battle them agian.(unless you have a action replay)
You can't battle Azelf unless cheats are used
You can battle him five times
You battle them like 8 times
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No, Azelf will not come back in Pokémon Diamond once you have defeated it in a battle or you have ran from the battle. Mesprit, 1 of the 2 Pokémon that you encounter in a cave, it will flee once you interact with it but you will be able to run into it as you're walking across the region.
you have 2 beat the battle dome 5 times for silver and 10 for gold you have 2 beat the battle dome 5 times for silver and 10 for gold
5 times for silver 10 for gold
3 times in a row
you go to all the caves in sinnoh (volar azelf acuity uxie and verity mespirt) and you will see them. battle them a try to catch them .But when you talk to Mespirt he will disappear .he will be roaming around sinnoh.
As many times as you want