Newton (Flapple) (M) @ Life Orb
Ability: Hustle
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Grav Apple
- Outrage
- Substitute
- Dragon Dance
Substitute is there to make matters easier against status, giving better opportunities to SetUp Dragon Dance and to save you in case Hustle makes you miss. Also this mon's coverage is awful anyways, so it's not like you miss on anything.
However, some moves deserve consideration:
- Sucker Punch: provides a form of Priority against faster threat
- Fly: Only to Dynamax and use it to beat bulky Grass types and to get a +1 in Speed if needed
- Heavy Slam: while incredibly weak because... You know, you weight 1 kg only, it becomes a 130 BP move during Dynamax, so you can blow away some bulky Fairies (Like G-Weezing)
Overall, while Flapple may find a niche in OU, it's holy outclass by Gyarados most of the time, so it would definitely end in UU.
On a separate but related note: is Dynamax, as of now, banned from UU?