There are two ways to obtain the Hylian Shield and Champion Tunic from The Legend Of Zelda series. The Master Sword can only be obtained using amiibo. The way to obtain all three items is by chance using The Legend Of Zelda amiibo. Scan them to get random content. If you do not get any of the gear set, wait one day and try again. Repeat this process until you have the whole gear set. The other way to obtain the Hylian Shield and Campion Tunic are collecting them on the peak of the Throat Of The World, which is the highest mountain in the game. Find the small cave at the peak to get the two items from a chest inside. However, there is a Parrthurnax at the peak. Thus, it is recommended to be at a decent level to defeat the boss.