| Beads of Ruin | Details | Pokémon | 
| Name | Jp. Name | ||
| Beads of Ruin | わざわいのたま | ||
| Game's Text: | |||
| The power of the Pokémon's ruinous beads lowers the Sp. Def stats of all Pokémon except itself by 25%. It is also not affected by other Beads of Ruin abilities. | |||
| Blocks Role Play & Doodle | Blocks Receive & Power of Alchemy | Blocks Entrainment | Blocks Trace | 
| No | No | No | No | 
| Blocks Skill Swap & Wandering Spirit | Blocks Gastro Acid & Neutralizing Gas | Removed by Mold Breaker / Turboblaze / Teravolt | Not used if user is Transformed | 
| No | No | Yes | No | 
Pokémon that can have the Beads of Ruin ability:
| No. | Pic | Name | Type | Abilities | Base Stats | ||||||
| HP | Att | Def | S.Att | S.Def | Spd | ||||||
| #1004 | 
 | Chi-Yu |     | Beads of Ruin | 55 | 80 | 80 | 135 | 120 | 100 | |
Pokémon that can have the Beads of Ruin ability as their Hidden Ability:
| No. | Pic | Name | Type | Abilities | Base Stats | |||||
| HP | Att | Def | S.Att | S.Def | Spd | |||||

