For something like Sunkern, of course its as simple as "Oh yeah, you can totally evolve this into a Sunflora, we just need 50 candies and a Sun Stone". Then there's Eevee, "Oh yeah, Eevee is great, you know what's even better? A Fire doggo. All you need is 25 candies and a Fire Stone. But wait, there's more, you could also get yourself a water doggo, but that's 25 candies and a Water Stone, not a fire stone. You know what? How about a Zappy doggo too? That's 25 candies plus a Thunder Stone. Not a Water Stone, not a Fire Stone, but Thunder Stone. Hey, how about them mystical psychic and dark doggos? Yeah, there's that buddy whatevers mixed in there somewhere"