The OP still says week 2, you might wanna fix that.
You messed up the EVs xD, it's supposed to be 252 HP / 172 Def / 84 SpDStolen from the OU Good Cores thread:
Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 184 Def / 72 SpD
Calm Nature
- Softboiled
- Calm Mind
- Moonblast
- Flamethrower
Gliscor comes in easily on Heatran and non HP-Ice Landorus-I and non-Icy Wind Gengar, all of which gives Clefable trouble. In return, Clefable can help to check Latios, Thundurus, Keldeo and Weavile while also soft-checking Kyurem-B which forces Gliscor out.