Magenta Pikmin

Magenta Pikmin are found in Pikmin SP in the Silent Spring. Being the second and last pikmin found there, they are actually very useful. This pikmin will never lose its flower. When you sprout Magenta Pikmin, they will have a flower as soon as they are in the ground. These pikmin are located underground, via Plum Candypop Buds. They do not have an onion, and the first place you will ever meet them in is the Waterfall Domain, final cave of Silent Spring. They prove very useful in a later boss fight.

Possible Canon
A type of Pikmin nicknamed the "Magenta Pikmin" was spotted in a Pikmin 3 trailer. When the spokesperson was asked whether they did indeed exist or not, she stated that she was not permitted to confirm or deny their existence. For the full story, visit Magenta Pikmin.

In Pikmin: Triad war the magenta Pikmin are immune to nature hazards and are the only pikmin that are immune to laser and are capable of completing lasers puzzles. For each one that the player has in their group, the spicy spray effect is increased by...
 * Leaf=2%
 * Bud=4%
 * Flower=5% + 25% chance to cause a spicy spray effect themselves during battle.

However, they are twice as weak as normal pikmin. They have long purple hair. Their flowers and buds are lime.

In “Pikmin: Dual Worlds”
Magenta Pikmin have iron on their wrists, feet, and stems. On the wrists and stems it's in the shape of a U, on the feet it's just a covering coating the bottom of the foot. This foot coating allows them to walk over rust safely without dying. Using the U's, they can attach to a metal surface via magnetism. Magenta Pikmin are found in Red-Stage Rustland, which can be unlocked not long after getting Rock Pikmin.