u could trade it from someone else or get it from an event
yes you do
heck no! you need natinal dex!
you get the azure flute from an event then get national dex go to the top of spear pillar and use the azure flute a stairway will come down and you go up the stairs to the hall of orgins and meet arceus.
its arceus and u need to get a flute from a guy in pastoria after getting the national dex.... then go to mount cornet where you found dialga/palkia and he will be there
Arceus' number in the national pokedex is 493.
in stark mountain after natinal dex is obtained
461
The last Pokemon on the national dex is Arceus.
get 60 in your pokedex and go to oaks lab
461
wifi/ internet connection
You have to defeat Dialga,Palkia and Giratina.Then you have to get the action replay code for the Azure Flute,go to spear pillar and your Azure Flute makes a noise and there are some stairs that appear to lead up straight to Arceus.Hope this helped!