I like that our two pokemon serve different roles while also potentially working as speedy DPS. Drilbur would follow that trend. Maybe we'll even get a blitzkrieg trait out of it if we continue to focus up.
Roland is a generalist who can attack at any range, go ghost, and also apply damage over time.
Renne is pure range and can almost definitely activate bullet hell mode later on with an attack of every type, as well as being a psychic (the ultimate utility type) who can create shields.
Drilbur, maybe Riley, would be the one to charge in and deal direct damage and also offers a new front of combat, seeing as she could dig underground. We or our could escape through the ground, bury our opponents underground where she has homefield advantage, and just generally attack with the ground itself via ground, steel and a bit of rock.
All three are in addition to being fast as fuck, running circles around our opponents, whether through sheer speed, moving through places they can't follow, and teleportation.
Moving fast as fuck could be a good strategy for our future Genghis Khan here.