Aluminum Base
From Pixelmon Wiki
An Aluminum Base is created by placing an Aluminum Disc on an Anvil (by right-clicking on Anvil when holding the Disc), then using a hammer (holding left-click) on the Anvil. Eventually, the Disc will turn into an Aluminum Base, which can be right-clicked to be re-obtained. The Aluminum base is used to make every type of Poké Ball.