When spawned, it punches any zombies near it. Its attack is called Uppercut. Each punch deals 75 damage, and attacks every target twice, resulting it to deal 150 damage to its target.
In Garden Warfare 2, the damage has been significantly decreased to 20 per hit, resulting in a total of 40 damage. Its zombie counterpart is the Boxer Bot.
In Garden Warfare 2, there is a Halloween variant called the Boo Choy, created to celebrate the Lawn of Doom event; and an Easter Variant called the Basket Choy, created to celebrate the Springening event.
There is also a legendary variant called the Monk Choy. He has more health and 30 damage per punch. He was available from Rux. His attack is called the Dim Makchoy.
CLOSE RANGE: MELEE Makes up for his lack of range with devastating uppercuts.
Boo Choy
CLOSE RANGE: MELEE Mummy wraps don't make him stronger. But he sure is spooky.
Basket Choy
CLOSE RANGE: MELEE Only need one egg...err Bonk Choy in this basket.
Monk Choy
LEGENDARY CLOSE RANGE: MELEE Mastering Bonk Choyu Ninjitsu has made him stronger. More health, more damage.
Battle for Neighborville
Combo punches zombies in close proximity.
Strategies
This is best used in Garden Ops, near the Garden as it can defeat almost any zombie instantly, making it a very good plant to use. Although the Bonk Choy can kill zombies easily, it is vulnerable to ranged zombies that can keep an eye on it. In Gardens & Graveyards, it is useful for killing Spawnable Zombies, but can be easily defeated by players, as every playable zombie variant is ranged. This is best placed around or near corners, to ambush the zombie. Keep in mind that there is a small delay between each attack, so if more than two zombies come at a time, it is bound to take some damage.
The Bonk Choy can act as a hard counter to Coffin Zombies, Outhouse Zombies, and Barrel Pirates. This is because it deals 150 damage per attack and ignores armor, allowing it to kill aforementioned zombies in a single attack.
In Garden Warfare 2, Bonk Choy was significantly nerfed, only doing 40 damage total. This means it can only kill a Browncoat before reloading, making it much less useful than it was in the original Garden Warfare.
Gallery
Plants vs. Zombies Wiki has a gallery for Bonk Choy.