first of all it is not a meteorite and second of all if you talk to a girl in flororoma town she'll tell ya why.
you need an i-cheat or an action replay thank you
You must get this stone in emerald and transfer it with a Pokemon to diamond or pearl. You go to veilstone city and walk up to a meteorite and press A. you first Pokemon has to be holding the deoxes stone.
In Veilstone city. There should be 4 meteorites on the east side of town. If done correctly it should say Touching the meteorite balanced out the attributes of a certain Pokemon. That Pokemon is Deoxys.
There is no Pokemon mansion in emerald. only in Pokemon red yellow diamond pearl and platinum. The first apperance on the Pokemon mansion was in Pokemon red which was the first Pokemon game in 1995. thank you
Deoxys is changed into speed form by trading it to Pokemon emerald or by walking up to a meteorite in veilstone city in Pokemon diamond/pearl and pressing A while it is in your party (first slot).
I don't think Roselia evolves in Pokemon Sapphire, but i do know that it evolves in Pokemon Diamond and Pearl. If I'm wrong please do tell ASAP. Thank You.
Bill gives you the Meteorite when he takes you to One Island after you get the 7th Badge.
Action Replay.
you cant get a diamond on Pokemon pearl but you can get a pearl on diammond ...and pearl.
you bring it to the scientist at the museum
Meteorite falls
You can go back to the Professor in the town and give him the Meteorite. He'll give you a TM in exchange.