Least helpful moves?

I know splash is the worst move of all time, but what are some other ones that generally don't help much? I think imprison is one of them considering it's rare to face a pokemon that has some of the same moves as yours.

I suppose that After You could be useful on slow partner Pokemon in double and triple battles, and Imprison might work if your Pokemon has common moves, but they've both got a limited capacity.

Two moves that I always felt weren't that useful were Memento and Grudge. Sure, they both hinder the opposing Pokemon a little bit, but I think I'd rather use Explosion or something if I knew my Pokemon was about to faint.