Hey /vp/ when should i go with Will-o-Wisp, and when should i go with Toxic?

>>25674579
git gud
will-o-wisp on physical threats and toxic to wear down tanks

Why is Poison so useless?

There are generally two types of defensive Pokemon: Hard to kill shit and annoying shit. You generally run Toxic on the former and Burn/Par on the later. There's some overlap between the two, obviously.

File: 1444268879479.png (5KB, 299x279px) Image search: [Google] [Yandex] [Bing]

5KB, 299x279px

toxic on everything.
if it cant get poisoned, will-o.