ok so we all know how to get some pokemon by tradeing heres a list of them:

trade / get

machoke - machamp(or was it the other way arond?)
gravler - golem
haunter - gangar
polywirl - polywrath

now here are some that i bet u didnt know-(u gota give it an item befroe tradeing):

trade(item) / get

porygon(upgrade) - porygon2
onyx(metalcoat) - steelix
seadra(dragonscale) - kingdra
polywirl(kingsrock) - polytoad
slowbrow(kingsrock) - slowking
clampearl(deepseascale)- gorybys
clampearl(deepseatooth)- huntail(i forgot the name)

enjoy all ur new pokemon (if i missed some my bad ,im only one kid)