Flash Pants/Psychic Fish
Now swing Northeast on the highest bar. If you have difficulty, use the Grapplejack to cling to a bar. You should be at either a bunch of egg plants, or a chest. At the plants, just gently drop down, open the chest for the awesome power of the Iron Boomerang. It can be thrown 3 times in a row. I recommend sticking to your Grapplejack, though.
The 8th Evil Pig
After you defeat all seven evil pigs, go to the strange small room in the underground mines, they will tell you that you need to find seven friends to stand on the platforms. Do this and battle the 8th evil pig!
The Orange Pig
To get to this pig, you need to ride the Phoenix to the jungle, keep going to you get to the first cage. Now keep going left till you get to a tree you can climb on. Go up to the top, and jump to into the evil pig gate (providing you have the orange pig bag.) Kill him by throwing him into the bag as it turns your way.