Sigh. There is a Pokemon center in the place with the door to the elite four. It has a pokemart too. But if you're in the middle of the elite four, you can't heal your party. You have to depend on potions, which is a good tactic to beat the elite four.
(This is an obvious answer...)
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No you can trade anytime before beating the elite four.
No you don't. I caught it after I beat the Elite Four. You can catch it before or after. It doesn't matter.
yes. you can catch raquazza before you defeat the elite four.. he is in the sky pillar..
you do not necesarely have to beat the elite 4 to get arceus mostly because you can only get it via hack.
The rare Pokemon which you can get before the Elite Four in Pokemon Platinum are Giratina, Mesprit, Uxie, and Azelf.