might be interesting. such "skills" shouldn't be direct buffs for in-battle, but maybe out of battle stuff. Maybe get a 10% boost in EV points, or every 10 steps heals your pokemon by 1 hp. (like a reverse poison)
Actually, i'd love it if there was a skill which restored PP slowly. These wouldn't directly buff your pokemon, they wouldn't affect the metagame (except maybe the EV thing, but it wouldn't be an issue imho), but they'd help with in-game annoyances.
Idealism is seeing potential. Pragmatism is seeing consequences.