The format where Golisopod is most viable is NU. It can function as a solid Spiker and pivot in a metagame that usually uses Stealth Rocks. It also has access to Knock Off to get rid of Heavy-Duty Boots.
Golisopod @ Heavy-Duty Boots
Ability: Emergency Exit
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Liquidation
- First Impression
- Spikes
- Knock Off
Reuniclus is viable in several of the formats where it is available. However, it is currently most viable in RU. A bulky Calm Mind sweeper or Regenerator user is usually the way to go.
Reuniclus @ Leftovers / Life Orb
Ability: Magic Guard
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
- Psyshock
- Focus Blast / Shadow Ball
- Calm Mind
- Recover
Reuniclus @ Assault Vest
Ability: Regenerator
EVs: 248 HP / 24 Def / 236 SpD
Modest Nature
- Future Sight
- Psyshock
- Knock Off
- Focus Blast / Shadow Ball / Energy Ball