I don't know sorry I have the same problem.
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Unlock Wario and get the flower power in levels and you are metal.
Thats not a cap,but a power flower you can get it if you are wario,you can get power flower from ? Box and watch out for enemy in the ? Box
hit a ? box or go to the mirror room
Yes it is called infinite wing power and there is a cheat to make wing power a fire flower.
To unlock them you after collecting 12 stars look up in the castle circle and activate the red switch to unlock all ? blocks.