I already have 4 Raticates (one of which is powered-up to 325cp). And right now, I have 120 bits of Rattata candy to evolve even more of them. And every day I'm catching more Rattata.
- ok. So going forward, I can't imagine that I should waste stardust on powering-up my Raticates anymore? That was a mistake?
- should I just keep evolving new Raticates ad nauseam? 5, 10, 15, etc. more Raticates!! why?
Best Answer
While I wouldn't bother using stardust to level up your Raticates, I would definitely use up your candy evolving them. They give 500 experience each time you evolve a Pokémon (1000 when using a lucky egg). Therefore, while they may not be the best Pokémon out there, they give you a nice influx of experience.
TLDR: Evolve Raticates for experience, save your stardust for your best Pokémon, and turn the rats into candy when you get too many of them and need room for other Pokémon.
Note: like @wax eagle said, saving candy and rats to evolve at once with a lucky egg is a good strategy to level faster.