birth island but you need mystery gift to get the ticket and how to get mystery gift is go to any Pokemon mart where you buy stuff and you will see a bit of paper near the counter with lines on it go up to it and press A then spell in the lines LINK TOGTHER WITH ALL and the guy says you must know about mystery gift so start again and you will see mystery gift and press it and don't forget to use the wireless adapter.thank you from scarlett master of Pokemon :)
Seven island.
After you defeat the Elite Four.
Beat the Elite Four, Get Rainbowpass from cello,and tada! You are at seven island
you have to have the rainbow pass. you take the ferry
The gem is on six island not seven island and its inside a cave called dotted hole.
In Sevault Canyon on Seven Island.
you have to beat the trainers and the time in that place on seven island
On cinnabar island but you need to get the secret key in Pokemon mansion first.
technically there is one it is unown it looks like the alphabet.
You have to catch a larvitar at Sevault Canyon on Island Seven and evolve it.
Larvitar can be found on Seven Island at Sevault Canyon (southern part of the island).
You have to fight the Pokemon league to unlock island four, five, six, and seven.