#0800 · Gen 7 · Legendary

Necrozma (Dawn) — Best counters

Weaknesses

ghost×2.56 double weaknessdark×2.56 double weakness

	Pokémon	Fast move	Charged move	Weather	Score
1	Gengar (Mega)	ghostLickELITE	ghostShadow Ball	Fog	10020.7
2	Absol (Mega)	darkSnarl	darkBrutal SwingELITE	Fog	9118.9
3	Banette (Mega)	ghostHex	ghostShadow Ball	Fog	8718.1
4	Blacephalon	ghostAstonish	ghostShadow Ball	Fog	8517.7
5	Tyranitar (Mega)	darkBite	darkBrutal Swing	Fog	8417.4
6	Houndoom (Mega)	darkSnarl	darkFoul Play	Fog	8116.9
7	Darkrai	darkSnarl	ghostShadow Ball	Fog	7715.9
8	Chandelure	ghostHex	ghostShadow Ball	Fog	7615.7
9	Zoroark (Hisui)	darkSnarl	ghostShadow Ball	Fog	7615.7
10	Gengar	ghostLickELITE	ghostShadow Ball	Fog	7515.5
11	Dragapult	ghostAstonish	ghostShadow Ball	Fog	7214.9
12	Absol	darkSnarl	darkBrutal SwingELITE	Fog	7114.8
13	Alakazam (Mega)	psychicPsycho Cut	ghostShadow Ball	Fog · partial	7114.7
14	Lunala	ghostShadow Claw	ghostShadow Ball	Fog	7114.7
15	Hoopa	ghostAstonish	ghostShadow Ball	Fog	7114.7
16	Gholdengo	ghostHex	ghostShadow Ball	Fog	7014.6
17	Zoroark	darkSnarl	darkFoul Play	Fog	7014.6
18	Hoopa (Unbound)	ghostAstonish	ghostShadow Ball	Fog	7014.6
19	Salamence (Mega)	darkBite	darkBrutal Swing	Fog	7014.5
20	Hydreigon	darkBite	darkBrutal SwingELITE	Fog	6914.4

Ghost and Dark hits for ×2.56 — Necrozma (Dawn)'s Psychic/Ghost typing is double-weak, so those attackers outperform their score gap.
Fog weather boosts Ghost moves ×1.2 — the best time to battle Necrozma (Dawn).

Rankings are estimated cycle DPS (attack stat × move damage ÷ cycle time, with STAB and type effectiveness). Not a full battle simulation.