You have to fight the Pokemon league to unlock island four, five, six, and seven.
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"How do I get an ekans in Pokemon leafgreen?"You can't catch an ekans in Pokemon leafgreen, but you can catch it in Pokemon firered and trade it.I got my Ekans at route 10 at lv. 4
No where, as it as Gen 4 item.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
Not available before generation 4.
you find delibird in island number 4 in the snow caveDelibird is uncatchable in leafgreen get one from firered.