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Ultra-bitter spray is the purple colored spray that the player can get from ten purple Burgeoning Spiderwort berries, or by finding a concentrated dose. When used, it temporarily turns any nearby enemy or bomb-rock into stone, rendering them unable to do anything. In 2-Player Battle, this spray can also be used to disarm the opponent's Pikmin by planting them in the ground, and reverting all flower and bud Pikmin to leaves. Although the Pikmin will automatically jump back out of the ground after ten seconds, they will not regain their buds or flowers.
There are fewer ultra-bitter berry carrying Burgeoning Spiderworts, which makes the spray harder to obtain in comparison to ultra-spicy sprays. In addition, this spray is normally discovered after the ultra-spicy spray, because while ultra-spicy spray is found on the required path in the Awakening Wood, ultra-bitter spray is not found until after the acquisition of White Pikmin, near the Bulblax Kingdom. Unlike the ultra-spicy spray, this spray type does not return in Pikmin 3.
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This spray can be deployed by pressing / . Any enemy or bomb-rock in front of the leader instantly becomes mobilized and slowly turns into stone. After eight seconds, the enemies or bombs break free and resume their normal activities, but before they reach this point, they will begin shaking, as to warn the player that the petrification is ending. When an enemy is defeated while petrified, it will crumble to dust and leave behind one dosage of a liquid, this being either nectar or a spray. Bosses, however, will drop five doses of liquid. The Titan Dweevil will drop ten doses. The perceived chances of a single drop being nectar or a spray are as follows:
|Ultra-bitter spray nectar||7.5%|
|Ultra-spicy spray nectar||7.5%|
Any regular enemy that becomes petrified will have its defense decreased, however, any petrified boss will have its defense increased. Plants and Candypop Buds cannot be petrified at all, nor can hazards or other objects. Petrifying enemies that are in the process of eating any Pikmin will make it possible to save those Pikmin from dying.
If there are no enemies nearby, the leader will still spray it in the air, wasting one dosage. In the Piklopedia, the player can deploy ultra-bitter spray by pressing / . This does not affect the ultra-bitter spray quantity in the main story mode. It should also be noted that a petrified dormant bomb-rock will become active after the petrification ends, even if it wasn't attacked during.
- Fragile Hermit Crawmad: oddly, by petrifying a Hermit Crawmad, it can be damaged just by walking into it.
- Volatile Dweevil suicide: petrifying a Volatile Dweevil just as it's blowing up can cause it to kill itself while petrified.
- Bitter spicy spray: if a bitter spray nectar drop is absorbed while a petrified enemy dies, the game will count the spray nectar as if it were spicy nectar.
- Each enemy type has an individual multiplier setting for how long the petrification should last, but it is never given any use, as all of them have this value set to 1.0.
- These values are obtained from a fan-driven experiment, rounded to what are the most likely real values.