Hammer Arm is a Fighting-type move with 100 power and 90% accuracy. It also has the notable effect of reducing the user's Speed stat by one stage after it is used. This move is often chosen for its high damage potential, despite the drawback of decreased Speed, making it a strategic option for bulkier Pokémon that can afford the Speed reduction. It is particularly useful against Rock, Ice, Normal, Dark, and Steel-type opponents due to its type advantage. Hammer Arm's reliability and power make it a staple in many movesets where sheer force is required.