>>47661062>>47661083>>47661364>>47666912>>47667256He's not just a T-rex, he's a king. King of the dinos. It's not much but it's there. Having king's collar/beard is a very clever way of incorporating feathers into the design. Since Kalos is France, the reason Tyrunt evolves during the day and as a sun-like crest/crown is also a reference to King Louis XIV, a.k.a. the Sun King.
Aurorus meanwhile is based on a queen in a beautiful dress and jewels.