Dragapult is viable on both sides of the spectrum. However, I prefer specs pult. I'll provide a set for both.
Dragapult @Power herb/life orb
ability: Infiltrator
Nature: Adamant.
-Phantom force
-Dragon Darts
-U-turn
-Dragon dance/Steel wing.
Fairly self explanatory. Life orb for power or power herb so you can immediatly use a phantom force once. Phantom force is stab, dragon darts breaks sturdy and is 100 base power, U-turn to pivot and either ddance for setup or steel wing for fairies. Physical pult is a good dynamaxer, as steel wing can upgrade into max steelspike and phantom force into max phantasm, both of which have their drawbacks removed.
Dragapult @Choice Specs/Life Orb
Ability: Infiltrator
Nature: Modest.
-Shadow Ball
-Dragon Pulse/Draco meteor
-U-turn
-Fire Blast/Flamethrower/Thunderbolt
Again, self explanatory. Do not dynamax if your specs, as you will lose the effect. Only dynamax if you want to switch up moves and can't switch.
Specs or life orb for immediate power. Shadow ball and dragon pulse/Draco Meteor are solid stabs. U-turn for pivoting and your choice of coverage move.