How can you get eon ticket in sapphire version?

In sapphire you must get the national dex. Then beat the Elite Four/Pokemon League. Then talk to professer birch in front of steven you go home talk to your mom she says that your dad has something for you. You go to patalburg gym he ghives you the Eon ticket.

IS THIS USING CHEATS?

^ nope. If you just happen to trade between leaf green/fire red and sapphire you will get the national dex. After that, beat the elite four and nothing will change.