You can not. The Azure Flute is a hack-only item at the moment. However, there may be a time in the future where it will be released legitimately, since Arceus is a featured Pokemon in the upcoming film.
receive it as a mystery gift from battle revolution
you can not get it witout cheats,the best way to get it is action replay but yo need a code.
you go to the place and then use dive and thenn go to the spot that youget the flute and you use fly, then surf, then lightening superstriker30000000000000 and then you have the azure flute!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
At the time no way to get the Azure Flute exists without use of cheats or hacks.
u need an r4 with cheats
the only way to get the azure flute is over wi-fi trading its a reward
You can't get the Azure Flute without the Action Replay or event.
You cant.You need the azure flute for it.You can get an azure flute from a Nintendo Event or you use ...uh,arghh.... cheats.....
it isn't possible without cheating
you can not get the azure flute in pokemon diamond, pearl or platinum unless you use cheats like action replay
The fair way to get an Azure Flute is by an event. I forgot the date but search it in "serebii.net"
that can't, you must have azure flute, go to the place where you've found dialga/palkia and play on the azure flute (you can get the azure flute by Nintendo event)