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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.
While Horn Drill has massive potential, especially when paired with Mind Reader or the No Guard ability, use of the move is frowned upon in a competitive setting. Furthermore, it is banned under the OHKO Clause, which is in effect on the Smogon server.
Sheer Cold is an Ice-type equivalent.
Fissure is a Ground-type equivalent.
Guillotine is a Normal-type equivalent.