Headbutt Trees

Headbutt is available as a field move. Some Pokémon learn the move via level-up, or a Move Tutor in Ilex Forest teaches it for the cost of a Silver Leaf. Silver Leaves are the price for the various Move Tutors in Polished Crystal; a few Silver Leaves are hidden in Ilex Forest, and wild Oddish may hold one.

Headbutting a tree may now yield a Wing.

Headbutt Encounters

Headbutt encounters in Polished Crystal work in the same way as vanilla: the rightmost digit of your Trainer ID determines which trees in an area give rare encounters. Refer to Headbutt tree calculators for vanilla to find which trees to Headbutt, e.g. Pokestats' tree finder. (Make sure to select Crystal.) Vanilla calculators are at least applicable to the areas without map expansions and should suffice for e.g. Heracross hunting.

Notably, Azalea now has several more Headbutt trees so that the rare-encounter tree is accessible to all players, including those whose Trainer ID ends with 7.

For more detailed hunting, look up your target Pokémon in the Headbutting encounter tables to learn which type of area and tree to focus on, and then see the Headbutt tree map index to decide which area to visit.

Trivia

• In vanilla, only the Trainer ID ending with 7 led to no access to rare-encounter trees in Azalea.