Pikmin 3 download requires 5GB of storage, upload online scores
Planning on downloading Pikmin 3 instead of going the retail route? Then you’ll need 5GB of storage space. An additional 31MB is required for saves. Note that there’s only one save slot per user.
Pikmin 3’s Japanese Wii U eShop page also mentions Internet connectivity for uploading online scores of some sort. You’ll also be able to send screenshots through Miiverse – something that was announced previously.