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Polished Crystal has Wonder Trade but in an offline way, basically emulating the Gen. VI–VII online feature.

Procedure

Main database: wonder_trade.asm, valid_level.asm, variant_forms.asm

1. You trade a Pokémon through the machine behind the clerk in the center of Goldenrod PCC.
2. The game loads its level.
3. The game instantly returns a random Pokémon of the same level under the conditions of the valid level range and form.

Features

• Shininess: 4× chance of getting a Shiny Pokémon (1/1024)
• Abilities: equally possible with the Ability #1, #2, and the Hidden Ability (1/3 chance of each)
• Held items: a chance of a held item, affected by the level; also a slight chance of a rare item (much like Pickup)
• Gender: (for species with both genders) 1/2 chance of male and female, regardless of the gender ratio
• OT: randomly selected from internal lists

Egg-to-Egg Trade

Unlike the main series games, the machine can accept an Egg and return a random Egg.

Unobtainable Species

Wonder Trade can't send you:

• The Legendaries or other Pokémon that are static encounters
• Unown
• Eggs for non-Egg deposits

Item Chance

Main database: wonder_trade/held_items.asm, battle/abilities.asm

Item / Level	1–10	11–20	21–30	31–40	41–50	51–60	61–70	71–80	81–90	91–100
(Nothing)	70%	60%	50%	40%	30%
Oran Berry	10%	10%	10%	10%	10%	30%
Sitrus Berry	10%	10%	10%	10%	10%	10%	30%
Lum Berry	4%	10%	10%	10%	10%	10%	10%	30%
Leppa Berry	4%	4%	10%	10%	10%	10%	10%	10%	30%
Figy Berry		4%	4%	10%	10%	10%	10%	10%	10%	30%
Starf Berry			4%	4%	10%	10%	10%	10%	10%	10%
Ganlon Berry				4%	4%	10%	10%	10%	10%	10%
Petaya Berry					4%	4%	10%	10%	10%	10%
Leichi Berry						4%	4%	10%	10%	10%
Salac Berry							4%	4%	10%	10%
Apicot Berry								4%	4%	10%
Lansat Berry									4%	4%
Custap Berry										4%
Ability Capsule	1%				1%	1%				1%
Lucky Egg	1%	1%				1%	1%
Eviolite		1%	1%				1%	1%
Leftovers			1%	1%				1%	1%
Rare Candy				1%	1%				1%	1%