Water Bear

The Water Bear is a strange, unique lifeform found in Pikmin Z. Its entire body is gelatinous, it having six stubby legs to move around, and a round hole in front of the head.

Biology
The Water Bear is capable of changing its elemental body into multiple elements, and drops pools of said element onto the battlefield. It is not known how it does this.
 * Diet: ???
 * Predators: ???

Piklopedia Entry
''Little information I could gather on it. It's just too ... odd. Too unknown to be classified into anything, or truly work out into logic.''

standard form
At the beginning of the fight, the Water Bear moves around the arena in its standard form, which makes it vulnerable to attack. The only method to harm the creature is to get it in its water state. To do that, you're going to have to survive the attacks until it's finished, which it'll turn back to its standard state while it's recharging. Throw your Rock Pikmin at it, and it'll slide off the platform and into the water, turning it into its water state. Use your Water Pikmin to get at the core until it forces them out of it.
 * Its fire form covers the beast in a coat of lava, flames shooting out of its back. It does shake occasionally, which causes a rain of fire all over the arena which you'll have to avoid.
 * Its electric form turns its body yellow, static lightning shooting out in many directions. It'll immediately creating a electric shield around itself if you wander too close, killing Pikmin instantly within the range.
 * Its poison form is the most dangerous form, its body turning purple and bubbles popping from it. It will lay down and roll on the battlefield, making a streak of toxic goo on the ground.

true form
Once it's supposedly defeated, it will go into the water, and come back out as a much larger, gelatinous beast with multiple tentacles, each one a different hazard and element used against you. during this portion of the fight, it stays outside the platform, and whips down the tentacles at you, each one having a different effect on the arena: You're going to have to use your Pikmin to hit the arms. Each one is relatively weak, and a good swarm will destroy each arm until only the head remains. It'll lean in and shoot out water at you, and it's now you can throw your Pikmin at it to injure it. Keep attacking until it falls in defeat.
 * Fire arm - slams into the arena, leaving a patch of lava temporarily.
 * Electric arm - hovers above the arena, and launches electricity down at you.
 * Water Arm - sweeps over the arena.
 * Poison Arm - whips out poison balls down on the arena.