Go to the battle tower
In Pokemon Ruby and Sapphire Rayquaza can be found at the top of the Sky Pillar on Route 131 after defeating the Elite Four and the Champion. In Pokemon Emerald you can enter and catch Rayquaza before defeating the Elite Four during a story event.
I only know in Pokemon Sapphire It's inside the Meteor Falls.No Elite Four needed. already have a Shelgon and use a great ball or ultra ball to catch it.
DANCE
After you defeat the elite four on Pokemon sapphire you complete the pokedex and make all your Pokemon level 100.
Yes, after you have defeated the Elite four.
In Ever Grande City.
No
Elite Four Sidney/Sydney: Uses Dark Pokemon Elite Four Phoebe: Uses Ghost Pokemon Elite Four Glacia: Uses Ice Pokemon Elite Four Drake: Uses Dragon Pokemon Champion Steven: Uses mostly Steel & Rock Pokemon.
The only way to get a Linoone in Pokemon Diamond and Pearl is to migrate (transfer) a Zigzagoon or Linoone off of Pokemon Ruby, Sapphire, or Emerald. This can only be done AFTER defeating the Elite Four and the Champion.
Birth Island cannot be accessed, for Deoxys is obtainable at the ending of the Delta Episode after defeating the Elite Four.
After defeating the Elite Four once, their Pokemon are much stronger than before, and with new Pokemon. There is no new Elite Four to battle, though.
Wallace will always be the Champion, so he'll still be at the Elite Four.