>>44319352Flamethrower is the most consistent move and can be spammed no matter what.
Weather Ball is stronger, but can only be spammed when the sun is up.
Overheat does the most damage, but can't be spammed.
It's actually the top recommended set for OU, with Focus Blast as the only coverage, and Flamethrower being optionally replaceable with Roost (so that you can heal on a predicted switch)