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Just caught a Jolly Zygarde (+Speed, -Sp.Atk) which seems to be its best nature given the Stat weightings:
>Lvl. 70
>252 HP
>157 Attack
>189 Defense
>126 Sp. Atk
>159 Sp. Def
>170 Speed
Seems like a pretty decent legendary all round; though the moves it came with are sucky and not very unique:
>Crunch
>Earthquake
>Camouflage
>Dragon Pulse
That said, Camouflage seems somewhat interesting/useful in a Gen where Dragons can actually get fucked up (Its default Typing is Dragon/Ground; changed to Rock with Camouflage in battle)