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Deals damage and has a 30% chance to flinch the target.
Terrible distribution and low Base Power on a move with bad offensive typing make Heart Stamp an awful option. Stick with Zen Headbutt if you want a good physical Psychic-type attack.
Psycho Cut is a slightly more powerful option with a high critical hit ratio.
Zen Headbutt is a more powerful but less accurate option with a lower flinch rate.
Bite is a Dark-type equivalent.