Furfrou can be a great physical wall with the fur coat ability, and access to cotton guard. I don't know why furfrou is in 'PU'.
The set I run is:
Furfrou @ Leftovers
Ability: Fur Coat
EVs: 160 HP / 76 Atk / 252 Def / 10 SpD / 10 Spe
Impish Nature
- Cotton Guard
- Substitute
- Last Resort
This set will be easily countered with ghost types. cotton Guard, will make substitute OP, not easily broken, using those 2 moves before last resort can be a real sweep potential. Because in order to use last resort you need use every move you have before it.
The set I run is:

Furfrou @ Leftovers
Ability: Fur Coat
EVs: 160 HP / 76 Atk / 252 Def / 10 SpD / 10 Spe
Impish Nature
- Cotton Guard
- Substitute
- Last Resort
This set will be easily countered with ghost types. cotton Guard, will make substitute OP, not easily broken, using those 2 moves before last resort can be a real sweep potential. Because in order to use last resort you need use every move you have before it.