For bling .
Combined with the sapphire the ruby and sapphire will allow you to trade with ruby and sapphire and emerald.
clafairy
Use Dive.
on groudon
You don't. You have to trade an eevee to Pokemon Ruby to use one in the game.
u have 2 use a computer
use a moonstone
use the itemfinder
Use a GameShark.
EVEE
Yes.