Elves: Evolving from Charmander to Battle Tyrannosaurus

My name is Lin Xuan. I travelled through time and became a little fire dragon! Fortunately, I woke up to the lying down system, and I can upgrade it by eating, sleeping, sleeping and basking in the sun every day! But I didn't expect that my evolutionary route was so different that I could evolve into a battle tyrannosaurus beast!? ........... My name is Xia Lianxing, a champion-level peak trainer, known as the first genius in history! Twenty years before the rebirth of human extinction, I must reverse the historical process and save the fate of all mankind! Originally, I thought I had subdued a small fire dragon with unlimited potential. As a result, this guy is not interested in practising at all. He eats, sleeps and sleeps all day long, and relies on my legs to bask in the sun! But I didn't expect it to be like this! He also seems to be getting stronger at the speed of light! Unconsciously, it has far surpassed the mythical beast! Invincible in the world! Also, why hasn't my little fire dragon evolved into a fire-breathing dragon? What is the dragon-shaped elf wearing this golden armour?