Don't lie Jibaku, Gyarados alone is a good enough reason to run Thunderbolt on Genesect 9.9 in OU AND UBERS....Its your only way of knocking out Gyarados, also +0 Explosion does not OHKO.
Also in Ubers, Thunderbolt wrecks Flying Arceus and is your best option for Ho-Oh, Manaphy in the sun :)