He can carry up to 5
No, just Olimar.
By pikmin you must mean Olimar, who uses pikmin. You already have him. He is one of the beginning characters that you start out with. There is no way of unlocking him, as you already have him.
To pluck Pikmin you must be standing on a platform and press special (B, 1, etc).
Louis would come in similar to Olimar does, possibly with a different ship. He will either have the same pikmin that Olimar does, have bulbmin, or have pikmin and bulbmin. His final smash would be exactly like Olimar's. Basically, he would be an Olimar that is faster and can jump better. Louis will not be in Smash Brothers Brawl, however. That is my opinion, however.
Yes. Captain Olimar is a playable character in Super Smash Bros. Brawl, and he uses all five of the Pikmin that had been created at that time in his attacks. Red Pikmin cause fire damage, Yellow Pikmin cause electrical damage, Blue Pikmin cause regular damage, Purple Pikmin cause considerable damage, and White Pikmin cause poison damage.
In Pikmin 2, there is no name given to the ship, but is known generally as just "The Ship." The Super Smash Bros. Brawl trophy calls it the "Hocotate Ship."
Olimar
There is no official name for it. The game refers to it as "The Planet of Pikmin" or "Pikmin Planet." In Super Smash Bros. Brawl, it is referred to as the "Distant Planet." However, it isn't hard to figure out that Olimar actually crash-lands on Earth.
olimar
Besides the main Pikmin games, Pikmin and elements of Pikmin have appeared in other games:Super Smash Bros. Brawl had trophies of Captain Olimar, Pikmin, and several Pikmin enemies.Super Smash Bros. Melee had trophies of Captain Olimar and Pikmin.In Super Mario Galaxy, a space ship appeared that resembled the ship from Pikmin 2.Pikmin-themed items were available for download in Animal Crossing: City Folk.Pikmin can be seen running in flowers in Mario Golf: Toadstool Tour.
You have to be olimar. Just press B.
You just have to find it. It could appear anywhere.