#0213 · Gen 2

Shuckle — Best counters

Weaknesses

	Pokémon	Fast move	Charged move	Weather	Score
1	Kyogre (Primal)	waterWaterfall	waterOrigin PulseELITE	Rainy	10012.9
2	Metagross (Mega)	steelBullet Punch	steelMeteor MashELITE	Snow	8911.5
3	Diancie (Mega)	rockRock Throw	rockRock Slide	Partly Cloudy	8911.5
4	Swampert (Mega)	waterWater Gun	waterHydro CannonELITE	Rainy	8410.9
5	Tyranitar (Mega)	rockSmack DownELITE	rockStone Edge	Partly Cloudy	7910.2
6	Blastoise (Mega)	waterWater Gun	waterHydro CannonELITE	Rainy	7810.1
7	Gyarados (Mega)	waterWaterfall	waterHydro Pump	Rainy	7710.0
8	Sharpedo (Mega)	waterWaterfall	waterHydro Pump	Rainy	769.9
9	Kyogre	waterWaterfall	waterOrigin PulseELITE	Rainy	769.9
10	Metagross	steelBullet Punch	steelMeteor MashELITE	Snow	769.9
11	Aerodactyl (Mega)	rockRock Throw	rockRock Slide	Partly Cloudy	769.8
12	Rampardos	rockSmack Down	rockRock Slide	Partly Cloudy	759.7
13	Lucario (Mega)	steelBullet Punch	fightingAura Sphere	Overcast · partial	749.6
14	Zacian (Crowned)	steelMetal Claw	fairyPlay Rough	Overcast · partial	729.3
15	Eternatus	dragonDragon Tail	dragonDynamax CannonELITE	Windy	719.1
16	Quaquaval	waterWater Gun	waterHydro CannonELITE	Rainy	709.1
17	Dialga	steelMetal Claw	steelIron Head	Snow	709.1
18	Greninja	waterWater Shuriken	waterHydro CannonELITE	Rainy	699.0
19	Tyrantrum	rockRock Throw	rockMeteor Beam	Partly Cloudy	699.0
20	Kyurem (White)	steelSteel Wing	fireFusion Flare	Clear · partial	698.9

Shuckle is weak to Rock (×1.6), Steel (×1.6), Water (×1.6).
Watch its Bug/Rock/Steel moves — counters like Diancie (Mega) and Tyranitar (Mega) take super-effective damage from them.
Rainy weather boosts Water moves ×1.2 — the best time to battle Shuckle.

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