Before the releases of the Pikmin games, many trailers have been released showing a preview of the game. You can find most of them here. These are also used to advertise thier games when they come out, and others can be found on YouTube when you search "Pikmin Trailers." Here are the most popular trailers for the Pikmin games: 

Pikmin Trailers

Pikmin 2 Trailers

Pikmin 3 Trailers