Secret Testing Range
This level is a little hard, but the secret to the easy killing of a Gatling Groink is to bring all of your Pikmin, make the Purple Pikmin be up front and hit its backside. Or you can leave the Pikmin with Olimar or Louie, be the opposite one and make the two Gatling Groinks come close to each other; then go underneath them, running back and forth when the Gatling Groink's life circles are yellow or red.
This floor is very hard. Note you can lure the Man-at-Legs out of the water to make use of all of your Pikmin.
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