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)
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Johto is inaccessible on Leaf Green although Islands Four to Seven contain Johto Pokemon.
You can't have to trade from johto
get all the Pokemon in the pokedex then talk to birch
The johto Pokemon from FireRed, LeafGreen, and Emerald can be migrated to the DS. but the older games such as silver and gold do not fit in the DS.
Not any hoenn Pokemon but firered and leafgreen can catch alot of kanto and johto Pokemon ruby and sapphire can and can't.