Super Paper Mario Tips

Get the Space Helmet in Chapter 4-1
To get the space helmet needed to breathe in Chapter 4-1 you will need to do the following. Exit the area and see Merlon who will tell you he forgot he gave away the item you are looking for. Then go to Flipside's third floor and speak to the kid holding a fish bowl. He'll give you the bowl but you'll need to find a place to put the fish. Go to Flipside B1 and go all the way to the right to a body of water to release the fish. When you return to 4-1 you will be asked if you would like to use the helmet, say Yes and you're good to go.