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In Celadon City, of course.
Celadon City you will need to battle the Rocket infront of the poster in Celadon Game corner.
You get it from a rocket from the rocket hideout in Celadon city.
In the game corner in celadon city.
The Rocket Key is the Elevator Key that powers the elevator in the Celadon City Rocket Headquarters, under the Game Corner.
You need to first clear the Team Rocket Hideout in Celadon city.
Get the scliph from team rocket in celadon city get the silph scope from the team rocket hideout in celadon city NOTE(it is at the gamecorner), to get to the hideout, talk to the rocket guarding the poster and beat him, he will run east, follow him to a door
The Moon Stone in Celadon City can be found in the Rocket Hideout. The stone itself can be found on basement floor 2 and on the west side of the maze.
Silver wing you get from director in celadon city when you save him. Rainbow wing you can get in Pewter city.
clear out the rockets in celadon city
On the number islands. Pretty sure it's on 1 island. After you beat the bikers there, you have full access.
They are at the top of the Pokemon Tower. In order to get there though, you need to get the silph scope from Celadon city. It can be found in the basement of the Rocket Game Corner.