The Battle Maison is a facility similar to the Battle Towers and the Battle Subways from the previous games. The premise of playing here is to get a very long battling streak against trainers: using only one team, no items from the bag, and with healings between each battle, you need to get as far as possible.
In doing so, you earn BP to exchange for numerous valuable items. This is much harder than it sounds! The facility itself is found in Kiloude City after beating the game: it is the gold mansion in the center of the town. If you go further within to the battling area, you can speak with the receptionist to begin battle.
Like in the past, there are a number of restrictions, also shared by Lumiose's Battle Institute.
- **Flat Battles:** All battles will be Flat Battles. That is to say, Pokémon not at Level 50 are made to be Level 50: stats and EV growths will be adjusted appropriately. (Moves remain unchanged.)
- **Legendary Pokémon:** Most mainstream Legendary Pokémon are not allowed: this means you cannot use Mew, Mewtwo, Ho-oh, Lugia, Celebi, Kyogre, Groudon, Rayquaza, Jirachi, Deoxys, Dialga, Palkia, Giratina, Darkrai, Phione, Manaphy, Shaymin, Arceus, Victini, Reshiram, Zekrom, Kyurem, Meloetta, Genesect, Xerneas, Yveltal, and Zygarde.
- **Pseudo-Legendaries:** These Pokémon are allowed, per tradition: this means Articuno, Moltres, Zapdos, Entei, Suicune, Raikou, Latias, Latios, Regice, Regirock, Registeel, Rotom, Mesprit, Uxie, Azelf, Regigigas, Cresselia, Heatran, Cobalion, Terrakion, Virizion, Thundurus, Tornadus, Landorus, and Keldeo are allowed to battle.
- **Duplication:** Hold items (beyond having no items) and Pokémon species may not be repeated.
- **Quantities:** For Single Battles, you need three Pokémon; for Double and Rotation, you need four; and for Triple, you need six. If you use Multi Battles (you and someone against two others; the other may be human or AI), you only need two, but the battle format will be Double Battle.
After each battle win, you'll earn some BP (Battle Points) . BP is used to buy items at the exchange in the entrance of the Maison. The BP earned will increase significantly as time goes on.
For the most part, Trainers in the Battle Maison are completely random, except at the 20- and 50-win marks, at which point you'll battle an unique trainer according to the battle rules. Due to this chaotic nature, you will definitely want to construct a team well-fitted to fight any type of Pokémon.
Pokémon with huge move varieties, such as Lapras or Blaziken or Lucario or Charizard or Noivern or Dragonite, will be absolutely key to your survival. Hopefully you've gathered enough TMs and HMs throughout the Kalos region to modify some Pokémon to your needs.
During your challenge, you are allowed to interrupt it or save. Interrupting your challenge, unlike previous generations, is okay. Now you can take breaks to do Wi-Fi battles or whatever. It's a notable feature to series veterans ... and a welcome one! Your streak will end, however, if you lose a battle or opt to change battle types.
BP Exchange (Left Lady)
|Ability Capsule||200BP||Switches a Pokémon's two abilities (if it has two)|
|Absorb Bulb||32BP||If the holder is hit by a Water-type move, Special Attack goes up|
|Air Balloon||48BP||Makes the Pokémon immune to Ground-type moves until hit (which destroys the item)|
|Assault Vest||48BP||Raises Special Defense, but prevents status moves from being used|
|Bright Powder||48BP||Lowers the foes' accuracy|
|Calcium||2BP||Increases Special Attack EVs by 10 (up to 100 Special Attack or 510 overall)|
|Carbos||2BP||Increases Speed EVs by 10 (up to 100 Speed or 510 overall)|
|Cell Battery||32BP||If the holder is hit with an Electric-type move, its Attack rises|
|Choice Band||48BP||Increases Attack, but only allows one move to be used|
|Choice Specs||48BP||Raises Special Attack, but only allows one move to be used|
|Dubious Disc||32BP||Evolves Porygon2 into Porygon-Z when held during a trade|
|Electirizer||32BP||Evolves Electabuzz into Electivire when helding during a trade|
|Eject Button||32BP||If the holder is attacked, it switches with another Pokémon in your party|
|Flame Orb||16BP||Burns the holder: best used with moves (i.e. Fling) that make the opponent hold it|
|Focus Band||48BP||The holder may survive an attack that would otherwise KO it; it will have just 1 HP|
|Focus Sash||48BP||If at full HP, the holder cannot be KO'ed in one hit - it will survive with at least 1 HP left|
|HP Up||2BP||Increases HP EVs by 10 (up to 100 HP or 510 overall)|
|Iron||2BP||Increases Defense EVs by 10 (up to 100 Defense or 510 overall)|
|Iron Ball||48BP||Lowers Speed and negates Flying-type and Levitate designations|
|Life Orb||48BP||The power of moves is increased, but the holder also loses HP with each move|
|Magmarizer||32BP||Evolves Magmar into Magmortar when held during a trade|
|Muscle Band||48BP||Increases the power of Physical-class moves|
|Power Anklet||16BP||Doubles EV growth in Speed while lowering Speed in battle|
|Power Band||16BP||Doubles EV growth in Special Defense while lowering Speed in battle|
|Power Belt||16BP||Doubles EV growth in Defense while lowering Speed in battle|
|Power Bracer||16BP||Doubles EV growth in Attack while lowering Speed in battle|
|Power Herb||32BP||Lets a move that needs to charge be used immediately, but lowers the user's Happiness|
|Power Lens||16BP||Doubles EV growth in Special Attack while lowering Speed in battle|
|Power Weight||16BP||Doubles EV growth in Max HP while lowering Speed in battle|
|Protector||32BP||Evolves Rhydon into Rhyperior when held during a trade|
|Protein||2BP||Increases Attack EVs by 10 (up to 100 Attack or 510 overall)|
|Rare Candy||48BP||Causes an instant level-up, if the Pokémon is under Level 100|
|Razor Claw||48BP||Increases the critical-hit ratio of moves; evolves Sneasel into Weavile if held while leveling-up at night.|
|Razor Fang||48BP||Makes hit enemies flinch; evolves Gligar into Gliscor if held while leveling-up at night.|
|Reaper Cloth||32BP||Evolves Dusclops into Dusknoir when held during a trade.|
|Red Card||32BP||If the holder is hit by an enemy, the foe is removed from battle - this will end wild encounters|
|Ring Target||32BP||Moves that normally do nothing will now hit - use moves like Fling to give this to the enemy|
|Sachet||32BP||Evolves Spritzee into Aromatisse when held during a trade|
|Safety Goggles||48BP||The holder will not be affected by Hail, Sandstorm, or the various Powders|
|Scope Lens||48BP||Increases the holder's critical-hit ratio|
|Toxic Orb||16BP||Badly Poisons the holder|
|Up-Grade||32BP||Evolves Porygon into Porygon2 if held during a trade|
|Weakness Policy||32BP||If the holder is hit super effectively; then its Attack and Special Attack both rise sharply|
|Whipped Dream||32BP||Evolves Swirlix into Slurpuff if held during a trade|
|White Herb||32BP||Reverts lowered stats, but lowers Happiness - hold to use automatically|
|Wide Lens||48BP||Raises the accuracy of moves|
|Zinc||2BP||Increases Special Defense EVs by 10 (up to 100 Special Defense or 510 overall)|
|Zoom Lens||48BP||If the holder moves after the Pokémon it wants to hit, its accuracy is boosted|
BP Exchange (Right Lady)
|Dream Eater (TM85)||48BP||Absorbs HP; only works on Sleeping targets|
|Explosion (TM64)||48BP||User will faint|
|Incinerate (TM59)||16BP||If target holds a Berry, it is destroyed|
|Quash (TM60)||24BP||User makes target go last|
|Retaliate (TM67)||48BP||More powerful if ally fainted last turn|
|Roar (TM05)||24BP||Forces switch (ends wild battles)|
|Round (TM48)||16BP||Stronger if allies use Round, too|
|Sludge Wave (TM34)||32BP||May cause Poison|
|Smack Down (TM23)||32BP||Removes Flying-type designation|
|Steel Wing (TM51)||32BP||May raise the user's Special Defense|
|Swagger (TM87)||24BP||Confuses a target, but raises Attack sharply|
|Volt Switch (TM72)||48BP||User will switch out|