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The wielder gains 25% of its maximum HP when hit by an Electric-type attack and negates the attack. A Ground-type Pokemon with Volt Absorb will not heal any HP. Redirection effects (such as Lightningrod) take effect before Volt Absorb activates. Volt Absorb activates through Substitute but not Protect.
Due to Thundurus-T, Politoed's Drizzle, and Electric-type attacks being very strong in general this generation, Volt Absorb has a great use in being able to cover up an Electric-type weakness easily. Thundurus-T, Jolteon, and Lanturn can switch into most Electric-type Pokemon for free healing, though they should beware of coverage moves.
Found in Dream World