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Battle Palace

The Battle Palace is one of seven facilities located in the Battle Frontier, accessible only in Emerald. The Frontier Brain here is Spenser.

Modes

The Battle Palace has options for Single Battles and Double Battles.

The player can enter three Pokémon in Singles and three in Doubles.

Mechanics

Gimmick

The only action the player can make during a battle is switching their Pokémon. If the player chooses to attack, their Pokémon will decide which move to use based on their nature and current HP, or may choose not to use a move. The same logic applies to opposing Pokémon's move selection.

General

Mechanics that apply to every Facility are on the Battle Frontier page. Here are mechanics specific to the Battle Palace:

• Two Pokémon of the same species, or with the same held item, cannot be entered. Opposing Trainers will never use two Pokémon of the same species, or with the same held item.
• Items cannot be used during battle.
• The player's Pokémon will be automatically healed after every battle.
• Battles are conducted in rounds of 7. The player can save between battles in a round, but will not be able to do anything except complete the rest of the round when they load the game. The player can do anything between rounds without it affecting their streak.
• Items used or swapped (via Trick, Thief, Covet, or Knock Off) during the battle will be given back to the Pokémon after the battle.

Resources

• This post has a lot of general information, including AI quirks and opposing Pokémon's speed stats for both Level 50 and Open Level modes.
• Frontier Assistant by Actaeon

Frontier Brain

The Frontier Brain, Spenser, appears first after 20 battles and again after 41. After defeating him the second time, he will appear every 21 battles. His Pokémon have 16 IVs in his Silver Symbol battle and 31 in his Gold Symbol battle. His teams are as follows:

Silver Symbol

Spenser Battle (1st)

Pokémon		Nature	Item	Moves								HP EV	Atk EV	Def EV	SpA EV	SpD EV	Spe EV
	Crobat	Adamant	Brightpowder	Confuse Ray		Double Team		Toxic		Fly		152	0	0	100	106	152
	Slaking	Hardy	Scope Lens	Earthquake		Swagger		Shadow Ball		Brick Break		152	152	0	100	0	106
	Lapras	Quiet	Quick Claw	Ice Beam		Horn Drill		Confuse Ray		Protect		0	0	252	106	152	0

Gold Symbol

Spenser Battle (2nd)

Pokémon		Nature	Item	Moves								HP EV	Atk EV	Def EV	SpA EV	SpD EV	Spe EV
	Arcanine	Hasty	White Herb	Overheat		Extremespeed		Roar		Protect		6	252	252	0	0	0
	Slaking	Hardy	Scope Lens	Hyper Beam		Earthquake		Shadow Ball		Yawn		6	252	0	0	0	252
	Suicune	Hasty	King's Rock	Blizzard		Surf		Bite		Calm Mind		252	0	252	0	0	6

Trainers and Pokémon

The list of Trainers that can be encountered is located here. The list of Pokémon that can be encountered is located here.

Battle Points

In Singles, the player will receive 4 Points for winning the first round of seven battles, 4 for the second, 5 for the third, 5 for the fourth, etc. to a maximum of 15 Points per round. An additional 10 Points are added every time the player faces and defeats Spenser.

In Doubles, the player will receive 5 Points for winning the first round of seven battles, 5 for the second, 6 for the third, 6 for the fourth, etc. to a maximum of 15 Points per round.

Move Types

Every move is divided into one of three categories. These are named by the game as "Attack, Defense, and Support", but a better descriptor for them might be "Attack, Self-Targeting, and Enemy-Targeting". A Pokémon's nature and current HP will dictate the probabilities with which it will use each type of move.

If the game chooses a category that the Pokémon doesn't know any moves in, or if all the moves in the chosen category are disabled from being selected (due to Torment, Imprison, etc.), the game will do the following:

1. First, there is a flat 50% chance that the Pokémon will use no move, displaying a message that the Pokémon "appears incapable of using its power" and skipping the Pokémon's turn.
2. The game then counts up how many non-disabled moves the Pokémon has in the Attack and Defense categories. (It should be checking all three categories, but a bug means it checks Defense twice instead of ever checking Support.)
3. If one category has two or more moves, choose a random move from that category.
4. If both Attack and Defense have two moves, or if no category has two or more moves, choose a random move from the Pokémon's entire moveset.

The move categories are shown in the below table.

Natures

A Pokémon's nature will determine the probability that it will use a move from each of the three categories. If a Pokémon knows multiple moves of the same category, the game will choose a move to used based on normal Battle Frontier AI move selection procedures.

If the Pokémon's HP is below 50%, the probabilities change; these are also given in the below table, on the second line of each table cell. If there is no second line, the nature has the same probabilities at all HP.

Additionally, a Pokémon's nature determines which opposing Pokémon it will target in Double Battles when using a single-target move. Some Pokémon will choose to attack the foe with the higher HP (the "stronger" opponent), and some the foe with the lower HP (the "weaker" opponent). Two natures will choose to target a random opponent. If both foes have the same HP, then all Pokémon, regardless of nature, will choose a random target.