Yes you can
No
You unlock a new one when you beat a chapter in the game.
You Can't
unlock pure forest get blue sky meadow
a few days after manaphy comes back
You beat Darkrai then wait for a few in-game days.
Answer:Beat chapter 9 in story mode to unlock special episode Genius Igglybuff.
you don,t and you can"t
You have to beat chapter 13
No. Sky forme is actually only for Shaymin. And can only be obtained in platinum. You can still acquire shaymin in Pearl and Diamond, but you will be unable to unlock its Sky Forme without Platinum.
The Sky Piller is a place where you can find Rayquaza. In Sapphire and Ruby the Sky Piller is not accesible until the champion has been defeated. In Emerald it can be accesed after you awaken Rayquaza and it calms Kyogre and Groudon.