You cannot. Sorry.
no. you want start with first.
In the event of accidentally setting your Reshiram free, it will be released back into the wild but you won't see it again.
It will not come back to life.
No.
He moves left and right and roars alot but the only way he attacks is if someone accidentally bumps into him.
you go back to the cave where you caught groudon/kyorge
If you skipped up Groudon, you're screwed, he doesn't come back. Sorry :/
You cant, sorry.
Once you defeat Groudon, you can't battle him again. It's either you catch him the first time or don't.
in the far back of the hide out where groudon is located once you walk over to groudon he'll come he'll battle you, and groudon will awaken then run away. -I hope this helped =]
not a chance
There is a possibility that you can battle Groudon "more than once". If you save the game just before you battle Groudon, you can continually shut off the game and turn it back on for (technically) more than one chance to capture or defeat Groudon.