You can Give it a water stone for it to evolve into a Poliwrath OR you can trade it while it holds a KINGS ROCK for it to evolve into a Politoed
you have to evolve polwhirl with a certain stone dont know which stone and dont care what stone.
Gyardos does not evolve.
Qwilfish does not evolve.
Sandslash does not evolve.
Arbok does not evolve.
Ampharos does not evolve in Pokémon HeartGold.
No, Magneton cannot evolve in Pokémon HeartGold.
Corsola does not evolve
No, Sableye does not evolve.
you cant evolve it on heartgold u can only get it in a sinnoh game
Misdreavus doesn't evolve
No. Feraligatr does not evolve in any game.