You have to get the Rainbow Pass to get to 4 Island in Pokemon.
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the togepi egg is in the water labyrinth on 5 island, not on 4 island
icefall cave on island 4
Beat elite 4 and take the boat from vermilion city to six island
its on island 4. but to get there you have to have the rainbow pass then board the vermillion boat port.
You have to fight the Pokemon league to unlock island four, five, six, and seven.