Rampardos

Its powerful head butt has enough power to shatter even the most durable things upon impact.

Assurance (30): As long as the Defending Pokémon's remaining HP is 60 or less, this attack's base damage is 60 instead of 30.

Hasty Headbutt (100): Rampardos does 20 damage to itself. This attack's damage isn't affected by Weakness, Resistance, Poké-Powers, Poké-Bodies, or any other effects on the Defending Pokémon.