There's a DH base here so I did that and as expected it's full of grunts and those movement tiles found commonly on Team Rocket hideouts and such... a bit lengthy since aside from the usual Grunt spam I had to backtrack through the building to get 4 Shards hidden on the floor to access the last floor.
Fought Reginald yet again (wasn't too difficult since his team remained mostly unchanged) and got Rock Smash (which is totally useless without the badge which is located on the other side of the map)