Bellsprout, abra, mareep those are all I know
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Most electric types can learn flash like voltorb and magnemite.
Flash is an initial move learned by Volbeat in Generation IV. For the Pokemon who can learn Flash through TM70 in Generation IV, see http://bulbapedia.bulbagarden.net/wiki/Flash_(move)#Generation_IV_2.
If you can trade Pokemon from crystal version to gold version my guess is yes
A fake version of Pokemon gold
You are given a TM when you will need it.