Roaming pokemon - Natures

Hi guys,

Does anyone know if the natures of roaming pokemon like Suicune, Entei, Raikou and Latios are set upon the first encounter? The same thing with them being shiny?

If its anything like HH/SS roaming, they’re set when they first start roaming, and the only way to change it is to faint them and beat the E4 again. I haven’t fainted any legendaries though, so I don’t know if they respawn if not caught.

They respawn when ran away from or defeated in battle.

If u want a certain nature u should encounter them with a pokemon that has the ability Synchronize in ur 1st party slot that has the desired nature. The encountered pokemon will then 100% have the same nature as your pokemon with Synchronize.