Since V8 I've been having trouble finding the last of the six poliwag. Needless to say, the posted guide is made partly obsolete by the recent (amazing) map changes. These are the locations where I have found the first five poliwag:
Terajuma Jungle in the pool of water where you fight Valerie
Route 11
The Purification Forest by Sheridan
Wispy Path
Valor Mountain
In the guide, there is a poliwag on Terajuma Shore, but after using several repels and thorough searching, I have yet to find one. If any of ya'll could tell me where this slippery poliwag has run off to, it would sure make my day. Thanks!