The Battle Tower (Japanese: バトルタワーBattle Tower) in Generation III is located in the Hoenn region, and is a post-Pokémon League battle arena located in Hoenn's southeastern sea, inaccessible except by boat, as it connects to no routes. Its purpose is to provide a challenge to all comers, with the best and brightest Trainers from all over flocking to it to see who is the strongest.
The player must select three allowed Pokémon to participate in seven consecutive Single battles. The player's Pokémon will be restored to full health at the end of each battle. There are two level modes: level 50 and level 100, which dictate the opponent Pokémon's level.
Upon winning the seventh battle, the player will be given a prize, which depends on how many consecutive challenges a player has completed.
In Pokémon Ruby and Sapphire, a prize will be given away after each set of seven matches. A single, random prize will be given away, depending on the length of the player's winning streak. In Pokémon Emerald, like all other facilities in the Battle Frontier, Battle Points are awarded instead of prizes.
The Battle Tower in Emerald has expanded to include Double battle and Multi battle modes, and level 100 mode has been replaced with open level mode. Salon Maiden Anabel, however, will only appear in Single battle challenges.
In Double Battles, each Trainer uses four Pokémon and battles with two Pokémon at once.
In Multi battles, rather than having two Trainers using two Pokémon at a time, four Trainers use one Pokémon apiece in a Double Battle. Only two of the player's Pokémon are allowed to compete at once (with the same rules followed as before). This mode can either be used alone (where the player is accompanied by an apprentice or another computer-controlled Trainer) or when linked to another copy of Pokémon Emerald (via the Game Link Cable or Wireless Adapter accessories for Game Boy Advance), where another player contributes his or her Pokémon.
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Battle Points (BP) are awarded instead of items.
In Emerald, Salon Maiden Anabel appears as the 35th and 70th opponent, the last battles in the fifth and tenth passes through the tower, respectively. Anabel only appears in Single battle challenges.
Anabel first called on Alakazam in Talking a Good Game! to help her and Ash when they were attacked by Team Rocket. Alakazam was able to beat them with its powerful Psychic attacks. Ash then realized that Anabel was a Frontier Brain and that he would have to battle Alakazam. Ash chose Corphish for the match. Anabel had the ability to telepathically communicate with her Pokémon and give commands without saying a word. In the end, Alakazam easily defeated Corphish. Alakazam then went on to defeat Ash's Tauros before finally being defeated by his Pikachu, but not before weakening it.
In Second Time's the Charm!, Ash had a rematch with Anabel. Again, she chose Alakazam as her first Pokémon. It went head to head again with Ash's Corphish once again, but this time with a little bit of luck as well as Ash's quick thinking, Alakazam was defeated by Corphish's Bubble Beam.
Metagross was for the first time seen during Ash's first match against her, where it easily defeated Ash's Pikachu, losing the match for Ash. During Ash's rematch against Anabel, Metagross easily defeated Ash's Corphish, but the Iron Leg Pokémon finally tied with his Tauros, as its Meteor Mash collided with Tauros's Take Down.
Espeon, Anabel's favorite Pokémon, was seen during Ash's rematch against her, where it battled against Ash's Pikachu. Even though Espeon at first managed to overwhelm Pikachu with its speed and power, one of Pikachu's Thunderbolts put the lights off, making it impossible for both Anabel and Espeon to see where the next attack was coming from. This cost some critical hits for Espeon, and Pikachu was finally able to defeat the Sun Pokémon with a Volt Tackle, winning the match for Ash and earning him the Ability Symbol.
In Never Spritz a Knotty Sudowoodo, it was revealed that the Battle Tower had been constructed before six other battle facilities were added around it to form the Battle Frontier.
During the climax of the Emerald chapter, Guile Hideout took over the Battle Tower and brainwashed Anabel as his servant, forcing Emerald, Ruby, Sapphire, and Noland to fight their way through the Battle Tower challenge to reach the 70th floor at the top of the tower. Emerald, reaching the top floor first, engaged in a battle against the mind-controlled Anabel, but was hopelessly outmatched against her Raikou. Eventually, the strain of the mind control caused Anabel to fall unconcious. In exchange for Anabel's safety, Noland was forced to hand over information he managed to find out about Jirachi, allowing Guile Hideout use its wish-granting powers to summon a massive Kyogre-shaped mass of water to sink the Battle Frontier into the ocean.
Ruby, Sapphire, and Emerald were soon joined by Gold and Crystal, who revealed that the "statues" of Pokédex holders on display at the Battle Tower were actually real people who had gotten turned to stone and could only be saved by making a wish to Jirachi. Although Emerald's intial attempt at wishing for Jirachi to do this ended in a failure, after he had opened up to Ruby and Sapphire about his past, Jirachi accepted his wish and restored the petrified Pokédex holders back to normal. Together, the ten Pokédex holders united to fight the army of rental Pokémon under Guile's control while trying to figure out a way to defeat the monster Kyogre. Eventually, Red and Gold succeeded in destroying Guile's armor, Emerald managed calm down the rampaging rental Pokémon, and the Pokédex holders together used their Pokémon's ultimate attacks to destroy the monster Kyogre, ending Guile's plans and saving the Battle Frontier.
In Epilogue, Anabel told Emerald that since he had technically followed the Battle Tower challenge rules while climbing the tower and battling her at the top, he had earned himself the Ability Symbol.
In Final Battle: Versus The Salon Maiden, Enta challenged the Battle Tower in order battle Anabel, the final and strongest Frontier Brain. After making his way through enough Trainers, he finally reached Anabel. Scott tried to intervene, since Anabel going all out had crushed the confidence of many Trainers, including Rald, but Anabel and Enta argued against this. The fierce battle between the two Trainers eventually came down to a showdown between Enta's Ninetales and Anabel's Entei. In the end, the two Fire Pokémon ended up knocking each other out, resulting in a draw and thus leaving Enta without his final Frontier Symbol.