After you beat the game, you will have the power to change the leader at Chimecho's Assembly. You can not change the leader in a dungeon, though.
Yes
dungeon leader can be any Pokemon you recruit. you will be able to change leading Pokemon after you graduate .
he has to join u then complete the game and change to be him
You can't.
You cannot have your playable character be a Bellsprout in Pokemon Mystery Dungeon Explorers of Sky. You can, after completing the main plot, recruit a Bellsprout and change it to party leader which effectively allows you to play as a Bellsprout, just only in missions.
the pokemon's genders are set already..veronica (stupid answer!)
Yes. I just looked it up and the release date for the European's ( I say this because within a few months after their release it will probably be released in the States) Pokemon Mystery Dungeon Explorers Of The Sky is *viable to change* around November/December 2009. its coming in October 12 2009 to the US Answer: It's already released.(I own Pokemon mystery dungeon explorers of sky)
yes
Talk to one of the Shaymin in the village. At the top-right, I believe. It'll give you a Gracidea, which changes Shaymin's forme when used in a dungeon.
you cant
no
Go to shaymin village and talk to the shaymin near the fence, near The kangaskhan rock