Yes, in fact, I caught one last week on my latest playthrough of Blue!
You can find one at:Route 6, Route 22, Route 28, Route 30, Route 31,Route 35, Route 43, Route 44, Route 45,Violet City, Ecruteak City, Blackthorn City,Ruins of Alph, Ilex Forest, Mt. Silver, Cliff's Edge Gate,Viridian City, Cerulean CaveSafari Zone
First of all if you have seen a poliwag use the pokedex to find where it appears second use the good rod to fish it out. If you go to Fuchsia City and go to the house where you got the good rod then behind the house there is a pond. It is full of Poliwags! Hope this helps. :)
If you walk enough there is a pokewalker route beautiful beach where poliwag is commonPoliwag is a fairly common Pokemon in Soul Silver. It can be found on Route 6, 22, 28, 30, 31, 35, 43, 44, and 45, as well as in Violet City, Ecruteak City, Blackthorn City, the Ruins of Alph, Ilex Forest, Mount Silver, the Cliff Cave, Viridian City, and the Cerulean Cave. Try both Surfing and fishing with multiple Rods, and you'll come across one fairly quickly.You can also find it in the Safari Zone and using the Pokewalker routes "Beautiful Beach" and "Blue Lake."you catch poliwag on the blue lake pokewalker route
they're at route 218 in tall grass* at level 28, level 29, and last but not least, level 30.*Not water
Route 218 (PokeRadar): 12% chance, level 29-30.
Route 1, 2, 29, 30, 31, National Park, Route 36, 37 and all at Night time.
you will find it north to cherrygrove, on route 30
you need to find a finneon its at route 219 and canalave and route 220 and then evovle it it evoles around lv 30 and 40
Route 6, 22, 28, 30, 31, 35, 43, 44, Ruins of Alph, Ilex Forest, Ecruteak City, Voilet City. Mt. Silver, Viridian city, Blackthorn City, you need to fish it out.
(-29) + 30 is the same as 30-29 so the answer is 1
Poliwag evolves at lv 21, i have no idea what the previous answer was talking about, but as soon as poliwag reaches lv 21, it will evolve into poliwhirl.blue man. It is the evolved form of poliwhirl. and evolves into poliwrath.
23 and 29