Would a Brave nature be good to super train a Toxicroaks Attack & Sp Attack for Drain Punch & Sludge Wave?

Question

it's characteristic is Mischievous

Answer 1

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.

Answer 2

Brave nature is pretty decent, but if I were you I'd go for an ev canceling nature because that speed drop kinda sucks