Get the grand prize from the lottery in lilycove city and make sure the Pokemon who won was in your party go to pacifidlog town and go into the bottom right house talk to the old guy he will say he can see mirage island! Use surf and go east until you reach the island.
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The Mirage Island in the older Generation III games has a very slim of appearing. The Mirage Island randomly generates a number and if it matches the ID of one of your Pokemon, it will appear and accessible for 24 hours. An elderly man facing towards the window in Pacifidlog Town will let you know when Mirage Island appear.
you have to beat the elite four and go the cleio (you'll find him in the Pokemon centre on the first island) and find the ruby and sapphire. then he gives you the sevii island pass
No.
Lucario isn't in Sapphire,Sapphire is a Hoenn pokemon,Lucario is a sinnoh pokemon.
ITs at the bottom of island six in a place called dotted hole