Wonder Trade

Polished Crystal has an offline Wonder Trade, a Gen. VI–VII online feature. (wonder_trade.asm)

Procedure

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 (valid_level.asm, valid_variants.asm)

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.

Caution: There's an oversight where an Egg obtained in this way can enter a battle before hatching as if it had done. It'll be resolved in the future 9-bit Pokémon-ID update.

Unobtainable Species

Wonder Trade cannot send you:

• The Legendaries
• Unown
• Eggs for non-Egg deposits