Blissey; she could teach me how to better heal, and take care of myself, as well as people close to me.
Machamp; it could train me physically, try to be buff like it... LOL
Clefable; if things are going rough, but I had Clefable at my side, I'd always have that friend to reassure me that life is great, I should be happy, etc. Perhaps it could teach me a real-life equivalent of Metronome? :3