if you mean the place where you catch kyogre and rayquaza, route 47 after receiving kanto starter showing it to mr Pokemon and getting the blue orb
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in the radio tower
You go to lavender town for Kanto and Goldenrod for Johto
Celadon city, in the game room.
There is no basement in the radio tower. If you are referring to the underground tunnels it is located near the Name Rater's hut.
go to the battle tower. Across The Sea To The "Great Marsh".