>>58930506It's the one on the left, which leads to the Embedded Tower. Groudon and Kyogre will only appear once you get the Red/Blue Orb from Mr. Pokemon, and he will only give that to you once you get a Kanto starter from Professor Oak, who will make them available after you first defeat Red on Mt. Silver.
Show Professor Oak both a Groudon and a Kyogre caught at the Embedded Tower (met location must be there, and origin game must be HGSS) and he'll give you the Jade Orb, which makes Rayquaza appear at the Embedded Tower.
