#0378 · Gen 3 · Legendary

Regice — Best counters

Weaknesses

fighting×1.60rock×1.60steel×1.60fire×1.60

	Pokémon	Fast move	Charged move	Weather	Score
1	Lucario (Mega)	fightingForce PalmELITE	fightingAura Sphere	Overcast	10013.9
2	Blaziken (Mega)	fightingCounter	fireBlast BurnELITE	Clear · partial	9513.2
3	Charizard (Mega Y)	fireFire Spin	fireBlast BurnELITE	Clear	9212.8
4	Blacephalon	fireIncinerate	fireOverheat	Clear	8411.7
5	Heracross (Mega)	fightingCounter	fightingClose Combat	Overcast	8311.5
6	Metagross (Mega)	steelBullet Punch	steelMeteor MashELITE	Snow	8311.5
7	Diancie (Mega)	rockRock Throw	rockRock Slide	Partly Cloudy	8311.5
8	Alakazam (Mega)	fightingCounterELITE	fightingFocus Blast	Overcast	8111.2
9	Reshiram	fireFire Fang	fireFusion FlareELITE	Clear	8011.2
10	Charizard (Mega X)	fireFire Spin	fireBlast BurnELITE	Clear	7910.9
11	Pheromosa	fightingLow Kick	fightingFocus Blast	Overcast	7810.8
12	Kyurem (White)	steelSteel Wing	fireFusion Flare	Clear · partial	7710.6
13	Zacian (Crowned)	steelMetal Claw	fightingClose Combat	Overcast · partial	7610.6
14	Lucario	fightingForce PalmELITE	fightingAura Sphere	Overcast	7610.6
15	Lopunny (Mega)	fightingDouble Kick	fightingFocus Blast	Overcast	7510.4
16	Chandelure	fireFire Spin	fireOverheat	Clear	7410.3
17	Houndoom (Mega)	fireFire Fang	fireFire Blast	Clear	7410.3
18	Gallade (Mega)	fightingLow Kick	fightingClose Combat	Overcast	7410.3
19	Tyranitar (Mega)	rockSmack DownELITE	rockStone Edge	Partly Cloudy	7310.2
20	Latios (Mega)	psychicZen Headbutt	fightingAura Sphere	Overcast · partial	7210.0

Regice is weak to Fighting (×1.6), Rock (×1.6), Steel (×1.6), Fire (×1.6).
Watch its Ice/Fighting/Normal/Ground/Electric moves — counters like Lucario (Mega) and Blaziken (Mega) take super-effective damage from them.
Overcast weather boosts Fighting moves ×1.2 — the best time to battle Regice.

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