What level does Rydon in elvove?

In "Evolve," Rydon evolves into Rhyperior at level 55 when it is traded while holding a Protector. Rhyperior is a Ground/Rock-type Pokémon known for its high attack and defense stats. Rydon itself is a Rock/Ground-type Pokémon and is notable for being one of the first Pokémon ever designed.