You can either give it a water stone to evolve it into Poliwrath, or trade while it's holding a King's Rock to evolve it into Politoed.
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To make Poliwhirl evolve into a Poliwrath, give it a Water Stone. To make Poliwhirl evolve into a Politoad, you have to make it hold a Kings Rock and Trade it to a friend. Than make them trade it back. Poliwrath is better than Politoad because it has better Attack and better Defense. It also is part Fighting type!
Go to Cerulean City, and go to the house next to the Pokemon Center. Talk to the old man and he will trade his Jynx for your Poliwirl. *Your Jynx will be the same level as your Poliwirl.
hanter, machoke, kadabera, gravler, slowpoke@king's rock, onix@ metel plate, scyther@ metel plate, poliwirl@ kings rock/water stone, porygon@ upgrade @ = holding
Sun Stone -use on Sunkern to evolve into Sunflora and on Gloom to evolve into BellossomMoon Stone-use on Nidorina to evolve into Nidoqueen, Nidorino to evolve into Nidoking, Jigglypuff to evolve into Wigglytuff, Clefairy to evolve into Clefable or Skitty to evolve into DelcattyFire Stone-use on Eevee to evolve into Flareon, Growlithe to evolve into Arcanine or Vulpix to evolve into NinetalesThunderstone-use on Pikachu to evolve into Raichu or Eevee to evolve into JolteonWater Stone-use on Eevee to evolve into Vaporeon, Staryu to evolve into Starmie, Shellder to evolve into Cloyster or Lombre to evolve into LudicoloLeaf Stone-use on Gloom to evolve into Vileplume, Exeggcute to evolve into Exeggcutor or Nuzleaf to evolve into ShiftryShiny Stone-use on Togetic to evolve into Togekiss or Roselia to evolve into RoseradeDusk Stone-use on Misdreavus to evolve into Mismagius or Murkrow to evolve into HonchkrowDawn Stone-use on a Female Snorunt to evolve into Froslass or a male Kirlia to evolve into a GalladeOval Stone-Happiny has to hold during the day to evolve into Chansey
Gastrodon doesn't evolve.