Scaling warlock pets?

So this sounds confusing I'm sure. But here's the deal as far as I know hunter
Pets level. They gain stats. And even contain their very own talent tree.
Well. How about warlock pets. I know they are quest driven. And only available
At certain levels. But the imp gets stronger without a physical talent tree or leveling
"As far as I know" so is it based on gear stat rating ? People at level 80 with
5.4gs aren't casting imp firebolts at 300 damage a hit im hoping. Haha.

Sorry for the noobish question. I'm just new to the magic classes of wow.
Iv been playing since TBC and only warriors and rogue has interested me.
But now it's been 10 years in this same expansion and I think it's time to
Try other things out.

Thank you for looking over this.