What can you unlock after beating the elite 4 in Pokemon ruby?

* The Battle Frontier: A challenging set of facilities where players can test their skills against various powerful opponents.

* The Emerald Challenge: A difficult new game mode that can be unlocked by defeating the Elite Four and Steven Stone.

* The ability to catch legendary Pokémon: After beating the Elite Four and Steven Stone, players can encounter and capture legendary Pokémon such as Mewtwo and Groudon.

* The ability to rematch the Elite Four and Steven Stone: After beating the Elite Four and Steven Stone once, players can rematch them as many times as they want.