What it does
Beads of Ruin multiplies the Sp. Def stat of every Pokémon on the field — except the holder — by 0.75, automatically, from the first moment the holder is active. No activation, no turn cost, no weather or terrain condition.
The damage math: if the target's Sp. Def is 75% of its normal value, your special moves hit for 1 ÷ 0.75 ≈ ×1.33 of normal damage. This is a defense-side debuff, not an offense-side buff — it applies to every special attacker on your side, not just the holder.
A worked number: Cresselia at Lv50 with maximum Stat Points investment sits at roughly 150 effective Sp. Def. Under Beads of Ruin that drops to ~112. Chi-Yu's Dark Pulse with Choice Specs goes from dealing around 55% to roughly 73% — the difference between Cresselia comfortably surviving and being forced to switch or fall to follow-up damage on the next turn. Against Blissey, whose 135 base Sp. Def is among the highest in the game, the effective reduction brings her closer to a 101-base wall; Chi-Yu's Overheat (130 base power, Fire STAB ×1.5 → 195 effective) can now threaten the KO range without spending a turn on Nasty Plot first.
How does ×1.33 compare to other multipliers? A single Sp. Atk boost is ×1.5 — stronger in isolation. But Nasty Plot costs a full turn and requires Chi-Yu to survive without acting. Beads of Ruin is free every single turn the holder is alive. Stack Nasty Plot on top and the combined multiplier reaches roughly ×2.67 on special damage — the target's Sp. Def is effectively halved.
The holder itself is completely unaffected by its own ability. It is a one-sided offensive amplifier with no drawback.
Who runs it
Chi-Yu is the only Pokémon with Beads of Ruin. Fire/Dark type, 135 base Sp. Atk, with Flamethrower, Overheat, Dark Pulse, and its signature Ruination. The ability and the kit align perfectly — it's a special attacker that passively amplifies every special hit it and its teammates land.
Named archetypes that want Chi-Yu:
- Special wallbreaker: Running into Blissey and Cresselia cores? Chi-Yu warps the KO threshold on both in a single switch. What used to take two turns to wear down now falls into one-shot or force-switch range.
- Doubles special-offense pair: Paired alongside Flutter Mane, Iron Bundle, or any special attacker — both opponents' Sp. Def is cut simultaneously. The entire special offensive line benefits every turn Chi-Yu is active, not just Chi-Yu's own hits.
- Balanced-team coverage slot: Fire and Dark together hit a wide neutral range. Because the passive damage amplifier is always running, Chi-Yu doesn't need its item slot for a damage booster — Choice Scarf patches the Speed gap, Choice Specs pushes the output ceiling.
How to use it
In singles, the core decision is timing the switch. Chi-Yu's base 100 Speed places it above Cresselia (85) and Slowbro (30), but below Garchomp (102) and Gengar (110). Don't walk it into a faster physical revenge killer.
Two main lines of play:
- Choice Specs immediate pressure: Switch in, fire immediately. The ×1.33 multiplier pushes damage into ranges that force a response — the opponent either takes a massive hit or burns their switch. Read their switch-in and pick the right coverage move on the next turn.
- Nasty Plot on a free turn: After forcing a switch or predicting a non-damaging move, spend a turn setting up. The combined ×2.67 multiplier clears nearly any special wall in the game. This line is highest reward but requires knowing the opponent can't punish you.
In doubles, the ability is at its ceiling. Both opponents' Sp. Def is cut simultaneously — your entire special-attacking side fires into that debuffed bulk from turn one. A typical sequence: turn one, Ruination chips one target to 50% HP (fixed damage, ignores Sp. Def stat, ignores Beads of Ruin itself); turn two, Chi-Yu or a teammate cleans up the weakened target and maintains the numbers advantage. Pair Chi-Yu with a Follow Me or Rage Powder redirector for one turn of protection — that's often enough for two punishing hits to land. Watch out for Earthquake from your own team: it hits the ally in doubles, so plan positioning carefully if you're running a ground-type attacker alongside.
Tips & strategy
Common mistake autopsy: The most frequent error is cycling Chi-Yu in and out without a plan — two turns on field, then switched away, then brought back once, never staying long enough to matter. The ability only works while it's active on the field. If you keep it in reserve or rotate it out at the first sign of danger, the opponent never feels the debuff and your calculations are wrong all game. The fix: before the match, identify which opponents it's safe in front of. If the opponent's fastest physical threat is slower than base 100, Chi-Yu can stay much longer than most players let it.
What turns it off:
- Neutralizing Gas (Galarian Weezing) suppresses all field abilities while active — Beads of Ruin immediately stops functioning, opponent Sp. Def returns to full value. If Weezing-G is on the opposing team, factor this into every calculation.
- Gastro Acid removes the ability from Chi-Yu entirely for the rest of the battle. A Chi-Yu without Beads of Ruin is simply a moderately fast special attacker, which is fine but not the reason you brought it.
- Steel + high Sp. Def walls like Heatran or Toxapex resist Fire and Dark respectively; the discounted Sp. Def still holds up against most hits. These matchups need coverage from a teammate, not frontal pressure from Chi-Yu.
- Faster physical attackers — Garchomp, Weavile, Iron Valiant — can delete Chi-Yu before it contributes. Its physical bulk is 55 HP / 91 Def at base, which is not built to take physical hits.
Stacking with other Ruin abilities: If both sides have different Ruin ability holders active — say your Beads of Ruin vs. their Tablets of Ruin (Attack cut) user — each ability independently affects its respective stat. They don't interfere with each other. There's no scenario where two Beads of Ruin users are both active, so self-stacking is never a concern.
Champions-specific calibration: Stat Points spreads cap at 32 per stat — never import Smogon's 252 EV KO thresholds and expect them to be accurate here. Recalculate with Champions numbers. Also: Champions nerfed paralysis full-stop to 12.5% and capped sleep at 3 turns. Status-stalling Chi-Yu is significantly less reliable than it was in Scarlet/Violet — the cleaner answer is a faster physical attacker or a switch into a resist.