Dark Void said:By that logic, every deck, even ones with only 1 type of basic energy, should run Energy Search, because Heavy Ball is to Magnezone as Energy Search is to a single type of basic energy. Even decks with multiple targets for Energy Search (ie 6 Corners) don't run energy search, and you expect decks with only one target for Heavy Ball to run that? I don't think so.
All decks that use energy acceleration shouldn't use it so that they can have an extra energy to discard. All decks without energy acceleration (6 Corners) can't have Energy Search because they need all the energy they have to power up their attacks, so they would have no room to replace one with an Energy Search. In decks other than those, there is absolutely no reason not to play Energy Search, so they should.