Blizzard is viable, especially in hail, as it really packs a punch and can deal major damage. A Focus Sash can secure a few surprise KOs, but Expert Belt and Life Orb are generally better. Expert Belt is the preferred choice for most teams as it helps Genesect get a number of significant KOs with no drawbacks. Genesect can also use a Life Orb to increase its damage output, but it means that Genesect is worn down much faster.