Title says it all.
HP- Munchlax with 135
Attack- Archen with 112
Defense- Onix with 160
Special Attack - Abra and Solosis with 105
Speed- Diglett with 95
Special Defense - Mantyke with 120
Source: Showdown! List for each stat.
Hope I helped!
This is the current list for Gen. 8 Little Cup.