by Joshua, the 6th grader
Beware! These stamps are really hard to get, so it's good to know how to get them easily. One convenience is that they pretty much ranked easiest at the top, hardest at the bottom. So here you go!
Candy from a Pikmin
This stamp is for getting 10 candies from the Pikmin in 15 attacks. The knuckle seed is a huge help when trying to get this, but make sure that the Pikmin are closer then the... anything else. Another help is the hammer seed, because it causes them to lose multiple candies at once.
Clobber Olimar
This stamp is for landing 10 blows on Olimar in 1 round as Mii Pikmin. One thing to keep in mind, is that they didn't specify what time limit, so it'll be easier for you to get this one. You'll probably be able to hit him/her once before he/she starts attacking you, so grab a buddy, and start hitting him/her back and forth, over and over again! You can also use charged attacks to help also.
Rock Your Foes X5
The name is pretty self-explanatory, hit your enemies with rocks 5 times in 1 round (no, I don't mean Bulborbs and Beebs, instead I mean Mii Pikmin and Olimar!) This one can be done by getting close enough that they won't have much reaction time and throwing it, and doing it 5 times.
Incredible Comeback
This stamp is for
winning, even though at one point your team was losing by 30 candies! It's hard to imagine there's one harder then this one. The easiest thing to do is to team up with somebody else, tell them what you're planning (without the player as Olimar hearing) and putting it into action! The plan would to wait until Olimar has 30 candies, then start attacking!
Pacifist Victory
This stamp is on the bottom because it's for not attacking anyone and still winning! Firstly, it's pretty much impossible to do this
and win at the same time using Olimar, so don't attempt it. Also, try to get it solo as a Pikmin, and you'll be clobbered by Olimar (unless he/she is aiming for Pacifist Victory also.) So just about the only way to get this is to team up with another person, or a bunch of people, as Pikmin, and just stay behind, grabbing all the spare candy, and just hope you guys win!