Odl y Môr is a distinguished coastal town, renowned for its prestigious university. Players can explore the university which also houses the fourth gym. The town exudes an old-fashioned charm, with its cobblestone streets and historic architecture. There is a seafront, a department store, a Pokémon centre and a Pokémart.
The path north to Route 10 is initially blocked due to exceptionally strong winds but becomes accessibly once the player has beaten the Llais Hen gym.
Heading for the gym, the player is spotted by Dylan who challenges them to a battle. Dylan is impressed with how strong the player's team has become but advises them to be cautions them about this next gym— Dylan has heard that the fairy type gym leader, Olwen, uses an Ancestral Form Pokémon, as do all the subsequent gym leaders.
Vowing to find out more and get them some Ancestral Form Pokémon of their own too, he leaves to restock on battle supplies at the department store.
Read about the battle for the Ancient badge with Gym Leader Olwen here.