level up your Pokemon more for battles against your friends just for fun.
Cressilia
no regigigas does not
he is in the sky
rasp cavern
in the cave of icicles
yes
it is in daybreakruins i think
you never use it
you go there at the start of the game
pokemon originaly came from there mother
never after shaymin its giratina
in the forest past tilt city, I think?