Both Pikmin and Pikmin 2 were originally released on the GameCube, though they were remade for the Wii (New Play Control! Pikmin 2 was never released in the United States). Pikmin 3 will be exclusively for the Wii.
You can buy Pikmin 2 at any local video game store if they have it used in the GameCube section, but other than that you could only find it online, like on eBay. Pikmin 2 is quite rare now, and used games can sell for over $40.
Pikmin 3 is neither a GameCube nor a Wii game; it was released exclusively for the Wii U in 2013. It is the third installment in the Pikmin series, which originally began on the GameCube with the first Pikmin game in 2001. The series continued with Pikmin 2 on the GameCube and later expanded with Pikmin 4 for the Nintendo Switch.
No.
You cannot download Pikmin 2; you have to buy the game.
27 Blocks of memory on the Nintendo Gamecube.
When you are playing as Olimar, use his special (Button B) to pluck pikmin. Remember that you must be standing on something to pluck pikmin and that there is a limit to how many you can control.
No. Pikmin can only be played on the GameCube or Wii.
I don't know about the Gamecube version, but the Pikmin game for the Wii you can make fireworks come out of an Onion if you press '2' and let your Pikmin carry you back.
No. Pikmin is not a game that features GameCube-to-Game-Boy connectivity.
Olimar's ship in the original Pikmin is called the S.S. Dolphin (after the code name of the GameCube).
No, Pikmin 3 is for Wii U. Gamecube games ceased production when the Wii was released.