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.
Chat with our AI personalities
Most electric types can learn flash like voltorb and magnemite.
You are given a TM when you will need it.
Bellsprout, abra, mareep those are all I know
Most water type Pokemon can learn the move Waterfall.
Level 56.