Here are a few which I thought would be worthy for learning:
How about Mirror coat?
It seems good on Regice, Cresselia, and those other ones with a truckload of Special Defence...
Also Counter, for those Physical sponges such as Regirock and maybe Regigigas...to compensate for its (somewhat lame) ability.
And Nasty Plot also...no need to say why.
Aura sphere - its a never-miss attack with the most power (since most only have a base 60 power), and make it compatible to most Psychics, to counter dark types...and maybe that sometimes double-teaming Blissey.
Magnet bomb - those Pokemon who learns this recently has a really low Attack power, so why not make it an available move for tutoring to those Pokemon with higher attack power?
The 3 elemental punches & Night Slash- no need for explanations too.
...and Psycho Cut - only a few will learn this recently, and it could be a good move for normal types too.
*Hehe* Sorry for saying more than just one move, but I think it's better to say a lot what moves we wanted to be learned repeatedly.
There are many good moves too, but I'll only list a few.