Dratini can't learn Extremespeed in LeafGreen, but can learn it through breeding and as a prize in Crystal, HeartGold and SoulSilver. After answering all the Dragon Master's questions correctly in the Dragon Shrine, a Dratini with Extremespeed will be given as a prize.
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A typlosion can learn explsion
All Pokemon with a water-type can learn it. There are some other Pokemon that can learn it, but mostly water-Pokemon.
it is very rare that a furret can even learn extremespeed.
It can't learn that move cause it doesn't exist in leafgreen.
Any ghost type Pokemon can learn it.