I don't generally play PU, I'm more of an OU guy but I can try to contribute. :)
I'm confused on the Salac Berry on Mesprit and it's spread.
You're running stealth rock, but it doesn't have a defensive spread. But You have SpA Evs and isn't running an offensive spread.
Ruby Rose (Mesprit) @ Colbur Berry
Ability: Levitate
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Psyschock
- Ice Beam
- Signal Beam
- Calm Mind
The Colbur berry will help you set up, and the moves are more suited to the EV spread you had chosen.
Also I recommend changing your Archeops to a choice scarf set to act as a revenge killer for your team.
Gog (Archeops) (M) @ Choice Scarf
Ability: Defeatist
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- U-Turn
- Earthquake
- Stone Edge
- Switcheroo
Hope this helped!:)