Not seeing a lot of potential in either of these Pokemon. Defensively, both forms are terrible, as Rock by itself is a poor defensive typing, being weak to common attacking types such as Water, Ground, and Fighting, priority moves such as Mach Punch, Aqua Jet and Bullet Punch, and having poor synergy. This is only compounded by both forms' terrible bulk. Offensively, Midday Lycanroc might've been decent - it could utilize a Choice Band well given its high Speed and good Attack, but its movepool is extremely barren - the only notable coverage moves are Crunch, Fire Fang, Brick Break, and Thunder Fang, all which are relatively weak in the latter's case or provide bad coverage in the former's case.
One of the only viable sets I can think of right now is a suicide Stealth Rock lead for hyper offensive teams, which Midday Lycanroc could perform well due to its high Speed and access to both Taunt and Stealth Rock, although even this is severely outclassed by already popular suicide Stealth Rock leads such as Azelf and Garchomp.
Suicide Stealth Rock Lead
Lycanroc @ Focus Sash
Ability: Steadfast
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Stealth Rock
- Stone Edge
- Taunt
- Fire Fang
A Focus Sash is the preferred item as it guarantees Lycanroc two turns on the field, which it probably wouldn't have otherwise due to its terrible bulk. Steadfast is the only viable ability for this set, although it can be useful in some instances. For example, if Mega Lopunny tries to use Fake Out to break the sash, Lycanroc's Speed will rise and it will be able to outspeed Mega Lopunny on the next turn and get Stealth Rock up. 252 Speed EVs and a Jolly Nature allow Lycanroc to take advantage of its Speed tier.
Investing in Lycanroc's bulk would be a waste because it is so bad; as such, Attack is maxed out to give Lycanroc an offensive presence. The last EVs are put into Defense so Lycanroc can survive priority better, although offensive Scizor, Breloom and Azumarill still OHKO with Bullet Punch, Mach Punch and Aqua Jet respectively, so it really doesn't matter. Stone Edge is a good STAB move. Taunt stops slower Pokemon from setting up their hazards as well or removing the Stealth Rocks that Lycanroc sets up. Fire Fang hits popular hazard setters such as Ferrothorn and Skarmory super-effectively, doing a whopping 25% to Skarmory.
Why you would use this over Garchomp or Azelf, I have no idea, as Garchomp has better Attack, better bulk, a better defensive typing, and a better movepool, while Azelf has better bulk, better offense, higher Speed, and a vast array of utility moves such as Taunt, Skill Swap, and Explosion.