There is no key, its a button the poster that the rocket is guarding defeat him and go to the poster and press A.
Beat all the grunts in the hideout and stop the Electrode in the hideout.
u beat a grunt....
its in the game corner in celadon city
in the casino, click on the panel
it's on five island at the bottom of path going downwards.
Team rockets hideout in celedone city it will be with a grunt hiding in a room
There isn't one in Pokemon Heart Gold and Soul Silver, there's just 1 or 2 rockets scattered.
there is a secret switch behind the poster
you need to awaken Kyogre[in team aqua's hideout]Groudon[in team maga's hideout] and Rayquaza[in the sky pillar]
you need a special event so... TOO BAD
go to island 6 and go to the right till u c it
Celdon city gym in the casino place behind the poster where the team rocket member is in front of.