Pokémon Go: Save Your Candy for Gen 4

4th Generation Pokémon will be coming to Pokémon Go soon. When it finally releases, there will be 107 new Pokémon to catch. A handful of these will be obtainable by evolving Pokémon from previous Generations. In order to get a head start on completing your Gen 4 Pokédex, you can collect candy for the following Pokémon and choose the best of them to evolve. 

Magnemite → Magneton → Magnezone

Tangela → Tangrowth

Electabuzz → Electivire

Eevee → Leafeon

Misdreavus → Mismagius

Murkrow → Honchkrow

Togepi → Togetic → Togekiss

Gligar → Gliscor

Porygon → Porygon2 → Porygon-Z

Ralts → Kirlia → Gallade

Duskull → Dusclops → Dusknoir

Lickitung → Lickilicky

Rhyhorn → Rhydon → Rhyperior

Magmar → Magmortar

Eevee → Glaceon

Aipom → Ambipom

Sneasel → Weavile

Yanma → Yanmega

Swinub → Piloswine → Mamoswine

Roselia → Roserade

Nosepass → Probopass

Snorunt → Froslass

I got most of this information from an article on rankedboost.com. My focus was which Pokemon's candy you need to save up to evolve into Gen 4 Pokémon, but their article goes into more depth. Take a look at it to see all of the baby Pokémon and other Gen 4 Pokémon as well as their stats.