Monferno @ Choice Scarf
Ability: Iron Fist
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- U-Turn
- Thunder Punch
- Flare Blitz
- Close Combat
Normally, you'd be using Adamant Scarf if anything, given Jolly's offensive presence can be lackluster sometimes. But, since the tier shifts happened, Jolly has actually become more useful overall.
Adamant Scarf hits 391 Speed total, and really only outspeeds +1 Fraxure (384 Speed), if we're talking about threats with boosted Speed that need to be revenge killed. But, when using Jolly (430), Monferno is now able to outspeed Modest Gorebyss after a Shell Smash (406), and Modest Exeggutor in sun (418).
With Balance / BO falling out of style, threats like RP Regice (398), RP Adamant 252 Spe Relicanth (418), CB Ninjask (419), and Modest Scarf Chatot (420) have also shot up in usage. Jolly Scarf Monferno outspeeds and has SE coverage for all of these at 430 Speed, and gives you a degree of protection by revenging these threats.