Another newbie here, but I tried to do some research.
To outspeed that Typhlosion you'll need 215+ speed, which means either you go with Quick Claw (which its unobtainable by then) or get another pokemon to do so.
Your fastest pokemon (base stat wise) should be Hawlucha. It can outspeed, but I doubt you can one hit that Typhlosion.
The other option is Houndoom. It's your second fastest pokemon, and Flash Fire is a huge bonus, since that Eruption will do nothing. Try to get the speed up to 204 to outspeed the Darmanitan (since Rock Slide).
You should be able to get a chunk out of its H
