you have to beat the elite four and go the cleio (you'll find him in the Pokemon centre on the first island) and find the ruby and sapphire. then he gives you the sevii island pass
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Use HM cut on it.
its in the sevii islands i think on 6 island but im not 100%sure
The Sevii Islands are a fictional archipelago of nine large islands and several small islands surrounding them. They are far south of Kanto, and are home to several legendary Pokemon. They appear in Pokemon LeafGreen and FireRed, and peripherally in Pokemon Emerald.
There are Pokémon from Johto in Leaf Green, however you can only find them on the Sevii Islands. (That is after you beat the Elite Four)
on a island