it’s characteristic is Mischievous
Pleaselog inorregisterto add a comment.
I’d say no. Brave isn’t good because Toxicroak’s speed is already mediocre at base 85. Its optimum nature would be Jolly or Timid, depending if you want a physical or special set, but a physical set is more recommended for Toxicroak since it packs Sucker Punch.
Also, mixed sets are generally unadvisable for most Pokemon, with the few exception being Salamence & Infernape. Toxicroak is not suited for a mixed move set. If you want it to have a Poison move, go for Poison Jab.
Brave nature is pretty decent, but if I were you I’d go for an ev canceling nature because that speed drop kinda sucks