#0439 · Gen 4

Mime Jr — Best counters

Weaknesses

	Pokémon	Fast move	Charged move	Weather	Score
1	Gengar (Mega)	ghostLickELITE	ghostShadow Ball	Fog	10013.0
2	Metagross (Mega)	steelBullet Punch	steelMeteor MashELITE	Snow	8911.5
3	Banette (Mega)	ghostHex	ghostShadow Ball	Fog	8711.3
4	Beedrill (Mega)	poisonPoison Jab	poisonSludge Bomb	Overcast	8611.2
5	Blacephalon	ghostAstonish	ghostShadow Ball	Fog	8511.1
6	Deoxys (Attack)	poisonPoison Jab	electricZap Cannon	Rainy · partial	8010.4
7	Eternatus	poisonPoison Jab	poisonSludge Bomb	Overcast	7910.2
8	Lucario (Mega)	steelBullet Punch	ghostShadow Ball	Fog · partial	779.9
9	Metagross	steelBullet Punch	steelMeteor MashELITE	Snow	769.9
10	Zacian (Crowned)	steelMetal Claw	normalGiga Impact	Partly Cloudy · partial	769.9
11	Chandelure	ghostHex	ghostShadow Ball	Fog	769.8
12	Gengar	ghostLickELITE	ghostShadow Ball	Fog	759.7
13	Naganadel	poisonPoison Jab	poisonSludge Bomb	Overcast	759.7
14	Alakazam (Mega)	psychicPsycho Cut	ghostShadow Ball	Fog · partial	749.6
15	Zoroark (Hisui)	ghostShadow Claw	ghostShadow Ball	Fog	729.4
16	Dragapult	ghostAstonish	ghostShadow Ball	Fog	729.3
17	Eternatus (Eternamax)	poisonPoison Jab	poisonSludge Bomb	Overcast	719.2
18	Lunala	ghostShadow Claw	ghostShadow Ball	Fog	719.2
19	Gardevoir (Mega)	grassMagical Leaf	ghostShadow Ball	Fog · partial	719.2
20	Nihilego	poisonPoison Jab	poisonSludge Bomb	Overcast	719.2

Mime Jr is weak to Poison (×1.6), Ghost (×1.6), Steel (×1.6).
Watch its Psychic/Normal moves — counters like Gengar (Mega) and Beedrill (Mega) take super-effective damage from them.
Fog weather boosts Ghost moves ×1.2 — the best time to battle Mime Jr.

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