Evolving your Pokemon in Pokemon Go is one of the largest aspects of the game and the entire series. In Pokemon Go, after attaining a set amount of specific candies, you can evolve your Pokemon into their next more powerful stage. Unlike the original game, your trainer/Pokemon level does not matter, it all comes down to candies. 
In Pokemon Go though, you must first collect a number of candies. Three candies can be gained from catching a Pokemon and an additional one candy be earned from transferring one back to Professor Willow. Keep in mind that each breed of Pokemon has their own specific candy. So you wouldn't be able use a Bulbasaur candy to evolve your Charmander. So, if you want to evolve your Squirtle to a Wartortle, you'll need 25 Squirtle candies. To evolve your Wartortle to a Blasoise, you'll need 100 Squirtle candies. Below you'll find a master list for every evolution in Pokemon Go including the amount of candies you will need to reach the next stage.
Pokemon Go Evolutions
| Pokemon w/ Needed Candies | Evolution 1 w/ Needed Candies | Evolution 2 |
|---|---|---|
| --- | --- | --- | | Bulbasaur: 25 | Ivysaur: 100 | Venusaur | | Charmander: 25 | Charmeleon: 100 | Charizard | | Squirtle: 25 | Wartortle: 100 | Blastoise | | Caterpie: 12 | Metapod: 50 | Butterfree | | Weedle: 12 | Kakuna: 50 | Beedrill | | Pidgey: 12 | Pidgeotto: 50 | Pidgeot | | Rattata: 25 | Raticate | | Spearow: 50 | Fearow | | Ekans: 50 | Arbok | | Pikachu: 50 | Raichu | | Sandshrew: 50 | Sandslash | | Nidoran (F): 25 | Nidorina: 100 | Nidoqueen | | Nidoran (M): 25 | Nidorino: 100 | Nidoking | | Clefairy: 50 | Clefable | | Vulpix: 50 | Ninetales | | Jigglypuff: 50 | Wigglytuff | | Zubat: 50 | Golbat | | Oddish: 25 | Gloom: 100 | Vileplume | | Paras: 50 | Parasect | | Venonat: 50 | Venomoth | | Diglett: 50 | Dugtrio | | Meowth: 50 | Persian | | Psyduck: 50 | Golduck | | Mankey: 50 | Primeape | | Growlithe: 50 | Arcanine | | Poliwag: 25 | Poliwhirl: 100 | Poliwrath | | Abra: 25 | Kadabra: 100 | Alakazam | | Machop: 25 | Machoke: 100 | Machamp | | Bellsprout: 25 | Weepinbell: 100 | Victreebel | | Tentacool: 50 | Tentacruel | | Geodude: 25 | Graveler: 100 | Golem | | Ponyta: 50 | Rapidash | | Slowpoke: 50 | Slowbro | | Magnemite: 50 | Magneton | | Doduo: 50 | Dodrio | | Seel: 50 | Dewgong | | Grimer: 50 | Muk | | Shellder: 50 | Cloyster | | Gastly: 25 | Haunter: 100 | Gengar | | Drowzee: 50 | Hypno | | Krabby: 50 | Kingler | | Voltorb: 50 | Electrode | | Exeggcute: 50 | Exeggutor | | Cubone: 50 | Marowak | | Koffing: 50 | Weezing | | Rhyhorn: 50 | Rhydon | | Horsea: 50 | Seadra | | Goldeen: 50 | Seaking | | Staryu: 50 | Starmie | | Magikarp: 400 | Gyarados | | Eevee: 25 | Vaporeon | Jolteon Flareon | | Omanyte: 50 | Omastar | | Kabuto: 50 | Kabutops | | Dratini: 25 | Dragonair: 100 | Dragonite |