Lot a thum in Cerulean Cave.
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You can not catch it in leafgreen,but in firered you can.
Nowhere no hoenn Pokemon can be captured in leafgreen.
Catch 'em all
In Routes 225 and 226 using the Pokeradar.
"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