How do you get a red mask Because it says you need one to find miraculous..

1-you get the red mask very late in the game. You have to beat the game, then win the three Battle Royales , then the Champions tournament.
2-you don't need the red mask to find miraculous fossils. I have seen the hint that tells you to put on the mask, then go to Icegrip Plateau, and you'll find more gold fossils. Well, you could also put on the blue mask (available for donation point purchase) and go to Dusty Dunes, someplace like that for the same effect.
3-you ought to be able to find more miraculous rocks as you progress through the game. I have had luck finding them in the pay to dig sites in Treasure Lake and Hot Springs Heights. Also, collect dropping fossils and the guy in the Hare Club on Cranial Isle will give you a miraculous rock for every 20 fossils you give him. Frankly, that's how I got most of mine.
Hope this helps. Good luck!

What are you talking about? You get it after you win your fifth match in the castellio cup.