For ingame, EV training is very unnecessary and highly discouraged. If it's competitive, then sure, Butterfree could use the Speed.
If I know, killing Koffings raises speed very well, and that weird motorcycle dudes on the Bike park does help at training before going to the last Gyms. --- Some things are beautiful because they cannot be obtained. ~~ Gilgamesh
Koffing raises Defense. Remember the EVs given by a pokemon usually reflect its best stat. Speed is anything but that one. >_> --- gbchaosmaster http://i77.photobucket.com/albums/j70/gbchaosmaster/gbAmonAm.jpg
probably because serebii can conveniently list all pokemon which yield the desired type of EV, while that FAQ requires checking each pokemon individually to see if they provide good EVs or not
trying to use that FAQ to see what you can battle for a specific type of EV would be horrendously inefficient --- THIS IS WHAT I HATE A BOUT EVREY WEBSITE!! THERES SO MUCH PEOPLE READING AND POSTING STUIPED STUFF