What it does on the ladder
Decidueye appears on 0.04% of Regulation M-B teams, which
is 224th of the 277 Pokémon with enough games to measure.
The move it almost always carries is Protect, on 96.2% of sets.
The item is usually Focus Sash at 83.1%.
The ability is split: Overgrow on 90.3% and Long Reach on 9.7%.
Those are Smogon's published usage figures, not anything measured here, and they describe what
the ladder plays rather than what is strongest. The full set is in the panel above.
The Pokémon itself
Decidueye is number 724 in the National Dex, a Alola Pokémon, Grass and Ghost
with a base stat total of 530 — 45th of the 234 Pokémon
legal in this regulation. Its best stat is Attack at 107, 71st
in the format; its weakest is Speed at 70, 140th.
It can have Overgrow and Long Reach.
The Champions module tiers it UU.
It sits in a 3-stage line: Rowlet → Dartrix → Decidueye.
Not all of that line is legal in this regulation — Rowlet and Dartrix are not.
What gets through
As Grass and Ghost, 5 of the eighteen attacking types do extra damage to it. It
resists 4 and is immune to 2. The board above
has all of it. 6 other legal Pokémon share the same typing and the same board: Sinistcha, Gourgeist-Super, Trevenant, Gourgeist, Gourgeist-Large and others.
What threatens it
Smogon publishes no head-to-head checks-and-counters data for doubles formats, so this list is
computed, not measured: the most-played Regulation M-B Pokémon carrying a damaging
move of a type Decidueye takes extra damage from.
- Kingambit — Sucker Punch (Dark, ×2), on 99.9% of its sets
- Incineroar — Flare Blitz (Fire, ×2), on 91.1% of its sets
- Basculegion — Last Respects (Ghost, ×2), on 99.9% of its sets
- Charizard-Mega-Y — Heat Wave (Fire, ×2), on 99.9% of its sets
- Staraptor-Mega — Brave Bird (Flying, ×2), on 66.2% of its sets
- Delphox-Mega — Heat Wave (Fire, ×2), on 99.6% of its sets
Against its own formes
Decidueye has 2 legal formes in this regulation and they share a
typing, so the only thing separating them is the stat line.
This one has the highest Sp. Atk at 100, Sp. Def at 100 and Speed at 70 of the 2.
It has the lowest HP at 78, Attack at 107 and Defense at 75.
The others are Decidueye-Hisui.
Speed and weight
At level 50 with a boosting nature and full investment, Decidueye reaches
134 Speed; left uninvested with a neutral nature it sits at
90. Invested, it outruns 5 of the 20
most-used Pokémon in the regulation when they are invested too — which is the comparison that
decides who moves first.
It weighs 36.6 kg, so Grass Knot and Low Kick hit it for 60 base
power. That is a real consideration in a format where both are common.
Its move pool
Decidueye learns 96 moves in the Champions data.
56 of them do damage, across 10 of the eighteen
types, and 24 share a type with it and so get the same-type bonus.
Its hardest-hitting same-type move is Frenzy Plant at 150 base power.
It also has priority: Sucker Punch at +1 and Shadow Sneak at +1.
That pool is what the team builder reads from when you seat it, and the
damage calculator will take it as the attacker with
the form already chosen.
