You must have completed the previous quest, Jars of Slime, to unlock Sneevil Boxes.
Chat with our AI personalities
they unlock halo timelines
The boxes are just laying around on the floor. You don't need to kill any creatures (click on them to collect them).
because the cry matches the Pokemon that you have unlocked in your pokedex and if you see the boxes in seven island and match the cry you will move the box and unlock 8 island.
Supposedly, you can have up to 999 Star Medals, but the number you can get 281 from the worlds. The rest are from StreetPassing folks and getting them one by one from the Mystery Boxes (sometimes, they come in twos). Good luck!
You have to explode all the boxes