Hired adjutants can teach the field character a random one of their combat arts, like Healing Focus from brawlers. However, personal skills like Cyril's Point-Blank Volley can't be learn by anyother character unfortunately.
In Golden Deer route:
- Claude X Petra
- Byleth X Mercedes
- Lorenz X Marianne
- Ignatz X Raphael's little sister
- Dorothea X Hanneman
- Felix X Silvain (just one-sided, I don't think Silvain ever noticed);
- Catherine X Shamir