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.