Question

Is Impish (-SpA, +Def) good for Lucario?

Comments

What game are you asking about? What do you want to do with this Lucario? Do you want to battle other people, in-game trainers, or something else?

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If you are using it in a playthrought, that is a quite decent nature, however be aware that aura sphere will be weakned

Answer 1

In-game

Anything works

Competitively

Absolutely not. You want Adamant / Jolly for physical sets and Modest / Timid for special sets.

Answer 2

Impish on a lucario is bad considering its fraility with its 70/70/70 base defences, so in competitive, its better to just run Adamant/Jolly for physical sets and modest/timid for special sets.

In game playthroughs it works fine since anything works

Comments

what does this answer add to Z answer? or did i miss something?

Answer 3

That's a okay nature for a Lucario, but don't invest on using special moves on it, use physical moves.

That nature might tank an Earthquake.

Comments

Lucario isn't capable of tanking an earthquake

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It cant tank an eq, not even bulldoze

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It depends on which Pokémon is using Earthquake. The answer's not *totally* wrong, Impish 0/0 Lucario can tank an Earthquake from Abomasnow :V.
But yeah the answer can be better.