Question

Are Genesis Supernova and Stoked Sparksurfer affected by Sheer Force?

Comments

According to the damage calc, they are affected.

Answer 1

Furthermore, Anchor Shot, Eerie Spell, Genesis Supernova, Secret Power, Sparkling Aria, and Spirit Shackle are explicitly considered to have added effects that can be removed by Sheer Force.

Although the following moves are affected by the Ability, they currently cannot be learned by any Pokémon with Sheer Force:

Genesis Supernova
Stoked Sparksurfer

Source

Also, the damage calculator lists the ability which means that the move is affected by Sheer Force:

252 SpA Sheer Force Mew Genesis Supernova vs. 0 HP / 0 SpD Abomasnow: 375-442 (116.8 - 137.6%) -- guaranteed OHKO

252+ SpA Sheer Force Raichu-Alola Stoked Sparksurfer vs. 0 HP / 0 SpD Abomasnow: 188-222 (58.5 - 69.1%) -- guaranteed 2HKO

Source
So, if you manage to get Sheer Force on Mew / Alolan Raichu by changing their ability and use the Z-Moves, they would be affected by Sheer Force.

Hope this helps!

Answer 2

Yes

Although the following moves are affected by the Ability, they currently cannot be learned by any Pokémon with Sheer Force

Genesis Supernova

Stoked Sparksurfer

Source