Alright, you guys clearly need an explanation. In Klinklang/Vileplume especially, Kyurem/Groudon/Darkrai rarely one shot other guys. That means the opponent can retreat big EXs back on to the bench and can avoid giving the Klinklang player prizes. Raikou EX and sometimes Kyogre EX are for use endgame, where discarding Energies doesn't matter anymore and they can kill damaged Pokemon on the bench for the last few prizes.
And like I said, it one shots Tornadus EX. Yes, Zekrom does it as well, but Zekrom also damages itself and has 130 HP, meaning it gets OHKOed much easier, which is obviously counter-intuitive to Klinklang's strategy.