Go to Meteor Falls after beating the Elite Four. Go to the place where you got the TM for Iron Tail. There should be a door that leads to a large room. At the end of the room Steven is there looking for rare stones. Talk to him and you get to battle him. (I recommend you stock up on full restores and revives and have your pokemon at least level 50 or above his pokemon are around level 70)
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I believe you can get the rematch with Steven in emerald by battling the Elite four again.After that you can battle Steven.
Steven Stone is the most powerful trainer in Pokémon Emerald. He can be found in the upper area of Meteor Falls after defeating the Elite Four.
steven gives to to you because of a keckleon -_-'
...... stewen in emerald isn't a elite champion. there is wallace.
you dont