On closer inspection, the Tyranitar is dreaming of eating. He is moving his arms close to his face and swallowing despite being asleep, you walk up to him and he grabs you and snuggles up as if you are a teddy bear. You think it's cute for such a well-know toughie and snuggle up too.
He rolls over and dreams of eating again, you can see his other arm reach towards his mouth. Unwillingly, he takes you towards his mouth and drops you in! He then swallows and you are plunged into the abyss of his belly. Now you have to escape while he's still asleep, or at least before he eats...