The rocket team are not on four island. there are two grunts up a ways of Mt. Ember north of one island, however the Rocket Base is on five island. It requires two passwords if you want to enter. Work that bit out for yourself.
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its in the team rocket warehouse on five island
The two Rockets on one island are diging for the Ruby gem
Sludge bomb: team rocket HQ (island 5)
The first password you will get from 2 team rocket grunts at mt ember (after you get national dex). Second is in dotted hole at island 6 when the man working for team rocket who meets you near the sapphire
The Team Rocket guy leaves for Johto after you defeated him at the Golden Bridge. He goes back to the Team Rocket Hideout at Mahogany Town. (He leaves because he found out that Team Rocket has abandoned three years ago 8-) In soul silver team rocket comes back and no that's not right he goes to the Unova region he can be found in black and white but now he has a wife and a son. I know because i beat white like 2 times and i always see him in his house all like i used to be team rocket member but team rocket go bye bye.