Luxray's Quick Claw activated, why did it move last?

Question

So, I was battling with my Charizard and Trevenant out at the Battle Maison and a Luxray's (doubles) Quick Claw activated and it went last! Did it use Roar? I've never seen one with Roar. Or is my game glitched again?

Comments

What is strange about the Luxray's Quick Claw activating?

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In Battle Maison everything is possible to be found.
Also Quick Claw gives a +8 priority and have 20%  chance of activate and Luxray can learn Roar at level 23.

Quick Claw will not give +8 total priority, but +8 addiction to the priority of the move! This means the Roar having -6 Priority and +8 Quick Claw will be +2 Priority , which this can be compared to a Extreme Speed.

Strange is you see a Pokemon with an attack that can not learn.

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Hope this helps.

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It doesn't give +8 Priority, and even if it did, that would mean it would still have +2 Priority after Roar, the same as Extreme Speed

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''+8 priority to the move '' I can't explain right but it give +8 to a move, so a -6 Roar will get +8 and then it will get +2 Priority.
Hope you understand.

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I'm pretty sure it's just the priority bracket, but I'll check that out. I don't think i's +8. Also, you just explained what I litterally just explained.

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Ok (filler).

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It's the priority bracket, it's not +8 priority. I just looked it up. The answer's wrong :/. You also only explained the priority system, not why Luxray went last, or if it was a glitch or not. The other answer is right.

Answer 1

Quick Claw has a 20% chance to allow a move to go first in its priority bracket.
So Quick Claw does not give you +1 priority, it simply allows you to go first in its own priority bracket.
For example, if Quick Claw activated when you used Tackle(+0 priority) and the foe used Drain Punch(+0 priority), then you would go first. However, if you used Tackle and the foe used Extreme Speed, you will go last even if Quick Claw activated, and if you also used a +2 priority move, then you would go first.
So even if Luxray used Roar(-6 priority), it would still go last, unless the opponent also used a move with -6 priority.
I assume you were confused because Luxray went last even if Quick Ckaw activated.
If you are confused because Luxray used Roar, it can learn it at level 23.

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Source: Experience and this