ninja'd, by far the most requested egg move.
As keith said any -att nature can be perfectly viable depending on the spread.
I don't recommend calm (which usually means you're gonna make it a special wall) anymore because of the new items we just got, but to be honest it always struggled a lot at that.
Modest gives you the highest stat boost, but i'd personally pick timid due to the extremely vast amount of sets you'd be able to outspeed or tie with.
Some examples are: Kingdra, blaziken, medicham (same base speed), adamant heracross, adamant gyarados and pretty much all venusaurs (same speed again).
Make sure to have wow, disable and encore (the latter is extremely useful to setup against chansey).
Destiny bond is extremely situational, while memento is always used with other specific pokemon.