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Aside from the traditional battle and overworld style, players' Pokémon are also able to participate in Pokémon Contests where they can try and win in five contest categories: "Cool", "Beauty", "Cute", "Smart", and "Tough" competitions. The players' characters are given a device early on called the PokéNav, which allows players to view the world map, check their Pokémon's contest stats, and make and receive phone calls with trainers that they have met with whom they can chat or plan a battle. This replaces a function called "Trainer's Eyes", which allows players to register certain trainers and see when they are in the mood to battle. This also allows players to rebattle Gym Leaders, an ability not found in previous "Pokémon" games. "Emerald" includes several other new features and changes such as animations of Pokémon in-battle and an area called the Battle Frontier which is an expansion of the Battle Tower found in previous games. A man whom players encounter several times throughout the game will eventually allow them to access the Battle Frontier after beating the Pokémon League Champion. The Battle Frontier features the aforementioned Battle Tower in addition to six new areas. Completing these areas awards players with "Battle Points" which can be spent on prizes to use in and out of battle. The Japanese version features compatibility with the Nintendo e-Reader; however, this was cut for the English release due to its lack of success. Also featured is the Trainer Hill area which, in the Japanese version, is compatible with the e-Reader. Rare Pokémon that originated from earlier "Pokémon" games such as Mew, Lugia, and Ho-Oh were made available through an in-game event.