Obsidian Horn Fossil → Tyrinder (lv. 40) → Tyrantoa
#140 - Tyrinder (tyrannosaurus + cinder + kinder (children))
An ancient Pokémon revived from a fossil, they are thought to have lived in packs where the adults would care for the young communally, heating the eggs in lava fields.
#141 - Tyrantoa (tyrannosaurus + tyrant + Krakatoa)
Their bodies sprout shards of obsidian that grow constantly and break to give a razor-sharp edge. It is uncertain whether their tough armor was for dominance fights, or protection against something even bigger.
Design notes: T-rex, dragons, hybrid dinosaurs, Jurassic Park "ultimasaurus", Designasaurus II
How do you make T-rex even cooler? Put a bunch of spikes and shit on it
I continue to be Too Tired™ to do Base Stats/Abilities/Moves for my fakemon, so feel free to suggest in the comments.