It's right above rout 16 ( look at your map)
in the lostlorn forest with event johto trio
get hm waterfall on route 18 and use it up the waterfall in lostlorn
Cottonee can be found in Black in the Pinwheel Forest, Abundant Shrine, or the lostlorn forest. To get Cottonee in White you can either trade from Black, or go to the girl in Nacrene City and trade a Petilil (you can catch these in the Pinwheel Forest) for her Cottonee.
It is in Route 6, Lostlorn Forest, or Pinwheel Forest.
you can find them in pinwheel forest, lostlorn forest or abundant shrine
Lostlorn Forest and Route 12. You have a 5% chance of finding it in Lostlorn Forest and a 15% chance of finding it in Route 12.
Trade an event shiny Entei, Raikou, or Suicune to Pokemon black or white and go to lostlorn forest to get Zoroark, although I am not sure what to do there to get it. Sorry! :D
Venipede can be found in Pinwheel Forest and in Lostlorn Forest.
Pinwheel Forest, Abundant Shrine or Lostlorn Forest.
Venipede shows up in Pinwheel Forest and Lostlorn Forest
It is at Abrundant Shrine, Lostlorn Forest, and Pinwheel Forest. It's better to use a Great Ball for Pinwheel Forest and Lostlorn Forest, then use a Ultra Ball in Abundant Shrine.
Yanappu, (or Pansage in English) can be found in Yagaruma Forest, (Pinwheel Forest) and Illusion Forest, (Lostlorn Forest) as a ground shaking spot. The chance of finding in both forests are 10%.