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For ingame, EV training is very unnecessary and highly discouraged. If it's competitive, then sure, Butterfree could use the Speed.
Koffing raises Defense. Remember the EVs given by a pokemon usually reflect its best stat. Speed is anything but that one. >_>
you can always check here http://www.serebii.net/pokedex-rs/ to get a list of pokemon sorted by what EVs they giveedit: yes, ponyta gives 1 speed
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