It is not possible to combine the White and Black Flutes or any of the flutes in Pokémon Pearl.
You can't. It was only available in Pokemon Diamond, Pearl, and Platinum.
Did you go to Mt. Coronet and use the Black Flute?
Yes after you get the suiet key and give it to the ladie
you cant get the azure flute on Pokemon pearl except from trade events or trading
You cannot get the Azure Flute in Black 2 and White 2. Azure Flute is an item that is exclusive to the games of Pokémon Diamond, Pearl and Platinum.
The white flute I think attracts Pokemon. Later in the game you can also receive a black flute. The black flute on the other hand repels Pokemon.
You cannot get the Azure Flute in HeartGold. The Azure Flute is only capable of being used in Pokemon Diamond or Pearl. The Azure Flute can only be obtained by an event of some sort in Diamond and Pearl.
Nintendo Event
I'm not sure
u don't
You can't.
You can't without cheating