>>52792446To add to
>>52793318 , investing in bulk is not worth it because you either become dependant on agility to do anything, or on Tera to do reasonable damage, and Gallade has the luxury of being powerful enough without boosts other than Life Orb / Muscle Band.
The third coverage move can be sword dance instead to wallbreak when the opposing team archetype demands it, but that leaves you walled by psychic types whic are still abundant.
Jolly is also the optimal nature because 80 is a crowded speed tier, but Adamant gives you a reasonable boost in power in exchange to losing to 110 speed scarfers like gengar (I would not advise to run adamant since jolly gives you the jump on positive 70/75 as well as a tonne of scarfers after an agility).
As previously mentioned Gallade is not dependant on tera which means you can tera some other mon on your team to cover dangerous threats and leave Gallade as late game option to sweep a slightly weakened team.
If using Gallade in draft leagues then the third coverage move can be literally anything since he's a green and white swiss army knife for whatever weird threat they have (on top of the fact that most of his coverage options are either sharpness boosted or above 100 bp).