1.How do you get Islands 8-10 2. How do you get Deoxeys 3. Were is..

1. Islands 8 requires a Mystic Ticket to get to. Island 9 requires an Aurora Ticket to get to.

2. On Island 8 you can find: Lugia, Ho-Oh
On Island 9 you can find: Deoxys.

3. I have no clue where the Wonderspot is.

1. Island 8: Mystic Ticket, Island 9: Aurora, no such thing as ten island.

2. Use the Aurora Ticket and go to 9 Island, then solve a mind-bending puzzle, then you will face a level 30 Deoxys.

3. Don't know.

1 There is no island 10 . Although the 8th island is Navel rock while the 9th is the Birth Island . In Navel Rock you find Ho oh and Lugia and in Birth island you find Deoxus .Luckily for you I have wrap codes for the islands :
Navel Rock -> 6AADAC54 A0A4B6C7
Birth Island -> 554D9257 D0472EF8

2 Well to get to deoxus just use the wrap code to get to the Birth Island

3 The wonderspot is the paper in the mart near the seller . I guess you wanted to write there "link together with all" so as to collect mystery gifts but you can t because the events have already finished so just use my wrap codes and get to the event islands 8 and 9

Well I hope I helped ya bro .