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OHKOes the target. Will not have any effect if the target is a Ghost-type. Ignores accuracy and evasion modifiers. Will fail on opponents of a higher level. This attack's accuracy is equal to (user's level - target's level + 30)%. Pokemon with the ability Sturdy are immune.
None. OHKO moves are banned due to the OHKO Clause applied generically to all Smogon battles. It can be used in Random Wi-Fi matches, but note that the poor accuracy can cause serious problems.
Horn Drill is an equivalent.
Fissure is a Ground-type equivalent.
Sheer Cold is an Ice-type equivalent.