No.
Nope, Sorry. You can't.
you have to beat rayquaza to start evolving and having different leader pokemons.
yes
you cant
no
dungeon leader can be any Pokemon you recruit. you will be able to change leading Pokemon after you graduate .
Yes
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.
you can't (I think)
Sorry but to what i know no! But unless you have a action replay and some how get a code to change your name!so yeah
You can't.
you can't sorry man, but it ain't gona happen!