Conditional evolution

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Conditional evolution is a glitch effect which refers to the unexpected evolutions of Pokémon after battle, or outside of battle.

The Ilsty and ? evolution in Gold/Silver

These effects occur in both Pokémon Red, Blue, and Yellow and Pokémon Gold, Silver and Crystal.

In Generation I

A non-freezing Super Glitch (containing a 0x50 sub-tile on the saved copy of the screen) will give the player the expanded party, and will likely cause unexpected evolutions if the Super Glitch effects are activated in a Pokémon battle and the battle finishes.

YouTube video

YouTube video by ChickasaurusGL


In Generation II

The Ilsty and ? glitch involves viewing the hex 0x1C Glitch Unown in the Unown listing.

This causes a Pokémon called "ILSTY I PkPkPkHpPOKé ÄMn POKé" evolving into a Forretress, followed by a Graveler named "?" evolving into Golem.

Additionally, specific glitch Pokédex categories are capable of causing conditional evolution, such as Pokédex sorting 0x7C in Gold/Silver or Pokédex sorting 0xF3 in Crystal.

YouTube video

Ilsty and ?:

YouTube video by ChickasaurusGL