Question

I'm not sure which one.

Latios (M) @ Wise Glasses
Ability: Levitate
EVs: 4 HP, 252 SpAtk, 252 Spe
Modest Nature
Dragon Pulse
Shock Wave
Flamethrower
Psychic/Luster Purge

Comments

It can't learn flamethrower

Answer 1

K, here we go.

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Luster Purge: Deals damage and has a 50% chance to lower the opponent's Special Defense by 1 stage.

Psychic: Deals damage and has a 10% chance to lower the opponent's Special Defense by 1 stage.

Most Latios usually use Psychic, and in-game Psychic is better because of the higher BP. You'll be going for OHKOs, usually. (I'm assuming this is in-game because you're using Shock Wave).

So, I'd really recommend Psychic...

Answer 2

Psychic! Duh! Luster Purge has 70 Power and 100 Accuracy, Psychic has 100 accuracy and 90 Power. Luster Purge also has less PP.

Comments

Yes, but there's the 50% chance to lower SDef.