Random comments about the choice Scarf set:
1) I think Modest is pretty reasonable, and probably better than Timid on certain teams. Modest is still outrunning base 120s, so all of note that you're missing out on is Weavile, Jolteon, and +1 Adamant Dnite.
2) Since scarf Heatran is all but gone from the meta you wont really run into speed ties much, so EVs in both cases might want to be tuned to outrun base 120s and base 130s respectively with extra EVs added to bulk (I'm not sure if there's some site policy not to do this with choice sets, but that space right above Jolteon really is a speed wasteland).
3) HP Grass and HP Electric are in the additional comments. I think the last move being slashed as Flamethrower/HP Grass is pretty legit since HP Grass hits Politoed, Rotom-W, and especially Gastrodon better than Dragon Pulse, and can achieve 2HKOs in a lot of situations. Also with all these dragons and waters in the meta I rarely find myself in situations where I would need to use a fire move more than twice in a row anyway, and Overheat is pretty adequate for that. HP Electric on the other hand is pretty niche since basically it only hits Gyara and Aerodactyl.
PS! Alts: Rhys DeAnno, Insane Rhys, Rhys DA
PS! Challenges Completed: Randbats, Ubers
Suspect Votes: BW OU Round 1, 2, 9, 10