ya u can trade Pokemon in blue before u beat the elite four.
Yes, after beating the Elite Four, they will be roaming Kanto.
You can get Pokemon from the Honnen and Kanto region, and after beating the Elite Four you can get certain GSC Pokemon.
Yes.
YOU CAN'T, WITHOUT BEATING THEM!!!!!!!!!!!!!!!!!! or being beaten
hacks. and pokemon that are able to evolve with the dusk stone won't until you get the new pokedex (after beating the elite four)
yes
you have to start with charmander, and suicune roams the region after beating the elite four
You get it as your starter Pokemon or use action replay
No, you cannot.
Beating the elite-4 or catching palkia without a masterball.
By beating the elite for then Beating the champion.
in what game of Pokemon