Brawl Yard
As the name says, it takes place in a yard, similar to the one of the second sublevel in the Snagret Hole. An overturned bucket is in the middle of the area, which can be used as shelter from the Decorated Cannon Beetles. There is also no Gatling Groink on the bucket. Other enemies: Cloaking Burrow-nits, Shearwigs and possibly a few Sheargrubs.
Border Glitch
There is also an interesting glitch involved that allows Olimar and Louie to leave the border. The player should throw the Pikmin over the barrier, then walk to a Decorated Cannon Beetle that is near the wall. He/she should attack it, and when it buckles, walk in front of it; it might just throw a leader over the level boundary. This makes it possible to take the opponent's marble from behind. However, a second, invisible barrier will hinder the player from distancing to much from the yard.