Emperor Bulblax

Emperor Bulblax was the final boss of Pikmin, and was a returning boss in Pikmin 2. It resembled the game's iconic bulborb, only much, much larger with red eyes, an armored green back and a gigantic purple tongue used to slurp up armies of Pikmin. As deadly as the tongue was its massive weight itself- with a small hop it could crush Olimar's entire Pikmin squad.

The Final Trial
In the first Pikmin game, this monster lived across the sea in the farthest region, The Final Trial. After collecting twenty-nine of the ship parts, Olimar travelled here to get the last one. After finding a way across the pond, Emperor Bulblax was fought in a large, sandy arena. In order to get a good shot at its one weakpoint, its head, Olimar had to get it to eat the bomb-rocks that the yellow Pikmin could use in order to stun it with a blast from inside. Another way to attack it was to throw Pikmin at the side of its head while it prepared to send out its tongue. After its defeat, it gave up the last part, the Secret Safe, and Olimar returned home.

Subterranean Pygmies
When Olimar returned in Pikmin 2 he encountered the beast once more in Bulblax Kingdom. It was slightly smaller this time but was faster as well. However, it could be defeated easily with reds due to its low health or purples could pound on it as it rose from the ground, basically killing it. In the Cavern of Chaos and Hole of Heroes, even smaller varieties were encountered and were as easily defeated as the one in Bulblax Kingdom. They were nowhere as powerful or deadly as the one in The Final Trial.

Emperor's Realm
If you are able to unlock the last challenge mode arena in Pikmin 2, you'll be in for a nasty surprise at the bottom: a trio of Emperor Bulblaxes await. However, they are pygmies which can easily be defeated as long as you can lure them to eat the bomb-rocks. The place where they are fought is nearly identical to Sublevel 4 in the Cavern of Chaos.