Ok, here is a team with Assurance Regieleki. With rocks up you can do around 20-30 on the switch to recovery lacking ground types of OU. This may sound very bad but it actually does let it defeat mons like pert, Lando, Zyg etc in the long run. It can't beat Hippo still but that is a improvement none the less-
https://pokepast.es/a99806e2a4f25df8