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Battle Arena

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

Modes

The Battle Arena only allows for Single Battles. The player can enter three Pokémon.

Mechanics

Gimmick

Neither the player nor the opponent is allowed to switch Pokémon, and Pokémon will always be sent out in the order they are listed in the party. The two Pokémon on the field will engage in three turns' worth of combat. At the end of three turns, if neither Pokémon has fainted, the game will judge which Pokémon performed better using criteria listed below. The winning Pokémon stays on the field for the next round, and the losing Pokémon faints.

If either Pokémon faints before three turns are up, the next Pokémon will be sent out, and the next round begins.

General

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

• 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, Greta, appears first after 28 battles and again after 56. After defeating her the second time, she will appear every 28 battles with her Gold Symbol team. Her Pokémon have 20 IVs in her Silver Symbol battle and 31 in her Gold Symbol battle. The gender and Ability of her Pokémon are random. Her teams are as follows:

Silver Symbol

Greta Battle (1st)

Pokémon		Nature	Item	Moves								HP EV	Atk EV	Def EV	SpA EV	SpD EV	Spe EV
	Heracross	Jolly	Salac Berry	Megahorn		Rock Tomb		Endure		Reversal		106	152	0	0	100	152
	Umbreon	Calm	Leftovers	Body Slam		Confuse Ray		Psychic		Faint Attack		152	0	100	152	106	0
	Shedinja	Adamant	Brightpowder	Shadow Ball		Return		Confuse Ray		Aerial Ace		0	252	6	0	0	252

Gold Symbol

Greta Battle (2nd)

Pokémon		Nature	Item	Moves								HP EV	Atk EV	Def EV	SpA EV	SpD EV	Spe EV
	Umbreon	Calm	Chesto Berry	Double-Edge		Confuse Ray		Rest		Psychic		252	0	0	252	6	0
	Gengar	Modest	Leftovers	Psychic		Hypnosis		Dream Eater		Destiny Bond		252	0	252	6	0	0
	Breloom	Jolly	Lum Berry	Spore		Focus Punch		Giga Drain		Headbutt		6	252	0	0	0	252

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

The player's received Battle Points will increment as shown in the table below. 'Round' here refers to a set of seven battles. An additional 10 points are added to the below values every time the player faces and defeats Greta. 15 is the maximum (though it becomes 25 if the player faces Greta).

Scoring Mechanics

Judging a Pokémon's performance is based on three categories: Mind, Skill, and Body.

• Mind: Almost any move that deals damage is awarded 1 point. The exceptions are Counter, Bide, and Mirror Coat, which award 0 points, and Fake Out, which awards -1 point. Protect, Detect, and Endure award -1 point. All other moves award 0 points. The Pokémon with the higher point total wins the judgment for Mind.
• Skill: If a move fails to affect the opponent because of the opponent's ability, the user is awarded -3 points. If a move fails to affect the opponent for any other reason (type-based immunity, missing, etc), the user is awarded -2 points. The exception is if the move fails due to the opponent using Protect or Detect, in which case 0 points are awarded. If a move hits and is super-effective, the user is awarded 2 points. If the move hits and is not very effective, the user is awarded -1 point. In all other cases, the user is awarded 1 point. The Pokémon with the higher point total wins the judgment for Skill.
• Body: The game completes the following calculation for each Pokémon: (Pokémon's current HP * 100) / Pokémon's HP when the round started. Whichever Pokémon has the highest value wins the judgment for Body.