Rayquaza
Location:sky pillar
When you catch it:after the battle between groudon and kyogre is over
Level:70

Groudon
Location:Terra cave, after Elite4
Level:70

Kyogre
Location:marine cave, after Elite4
Level:70

Registeel
Location:Ancient tomb
Level:40

Regirock
Location:desert ruins
Level:40

Regice
Location:island cave
Level:40

Latios/latias
Location:In the tall grass/Southern Island
Level:40

Ho-oh/Lugia
Location:navel rock, need mystic ticket. to get it, go to a nintendo event
Level:70

Deoxys(speed)
Location:Birth island, need aurora ticket. to get it, go to a nintendo event
Level:30

Give credit please. I am a slow typer.

ALL this information is available on the main site. Furthermore, this is the wrong section. Emerald-related topics should go into Hoenn Discussion Section.