Does it make a difference to CP if you feed candies before or after evolving?

When you evolve a Pokemon, its CP circle stays as full as it did before.

As a result, it really doesn't matter in which order you boost a Pokemon. However, you should keep a few points in mind:

• Powerups cost more Candies the more CP a Pokemon has (based on a Pokemon's level).
• Powerups cost more Stardust the more CP a Pokemon has (again, based on level).

Cost will increase every second powerup.

Therefore, it makes sense to power up a Pokemon until it is near the upper end of your CP ring. As the ring stays in the same place, it will give you a rather decent CP per Candy ratio.

For example, if a Pokemon's max CP was 515 and it is currently at 425, it would make sense to power it up to 500 or more. At that point, you should evolve it, provided you have the candies.

Overall, you'll still be using fewer candies because you're doing most of your evolution on the lower side of the scale, and using the Evolution mechanic to sharply spike the Pokemon's CP.

There is no difference.

The cost (in candies and stardust) to power up a Pokemon is based on the following factors:

• The cost increases as the Pokemon's CP increases.
• Each Pokemon species has separate thresholds for the increases in power up costs.
• Evolutions have proportional thresholds for power up cost increases.

For example, a Rattata and a Jigglypuff at the same CP will have different power up costs. However, a Rattata and a Raticate with proportional CPs (Same place on the semicircle and same percentage of maximum CP) will have the same power up costs.

Since CP increases from power ups are also proportional across evolutions, you'll get the same results for the same amount of stardust and candies whether you power up the Pokemon before or after evolving it.

It should make no difference at all.

Each Pokemon you obtain will have two sets of values and a level, which are all used to determine the CP value. All Pokemon of the same species will share the same base stats, while each individual Pokemon will also have a unique set of individual values (IVs).

If you look at Pokemon at the same level, you'll find that the possible CP values are dependant on the IVs of each Pokemon. That is, at each level, there's a range of possible CPs for each type of Pokemon.

For example.

A level 1 Bulbasaur can have a CP value between 11 and 15, depending on the IVs of the Bulbasaur.

If you power up a Pokemon, its level will increase by one half level. The now level 1.5 Bulbasaur, will have a CP value between 24 and 31.

If you had two identical Bulbasaurs (not likely), you would find that either way you chose to power it up, you'd end up with the exact same Pokemon.

Keep in mind that you can only ever power up a Pokemon, to 1.5 levels above your trainer level. So for a level 1 trainer, you can only power up a Pokemon to level 2.5.

For the following example, the trainer level is 1, and we have two of the worst level 1 Bulbasaurs ever (0% IV). So in both scenarios, the Bulbasaur starts out at CP 11.

In the first example, we'll power him up to level 2.5 (the max we can). At this point, we'll have a Bulbasaur with a CP of 49. Once the Bulbasaur is at max level, we'll evolve it all the way up. After the first evolution, we'll have a 79 CP Ivysaur. Evolving again leaves us with a 131 CP Venusaur.

Starting with the second Bulbasaur, We'll evolve it into a 18 CP Ivysaur, and further evolve it into a 31 CP Venusaur. After powering up the Venusaur to level 2.5, we'll be left once again with a 131 CP Venusaur.

---

As you can see, in both scenarios we ended up with the same exact Pokemon.

Keep in mind, however, that as your trainer level increase, you'll catch more powerful Pokemon. So if you evolve a Pokemon when you're at lower trainer levels, you could find that you're catching more powerful wild Pokemon later.

All that being said, there's at least one advantage to evolving first. And that's knowing the evolved Pokemon's move set, prior to spending large amounts of stardust to power it up. If you evolve a Pokemon and the final evolution has a bad move set, you might not want to spend stardust powering it up. If instead you powered it up before evolving, you'll be stuck with a high CP Pokemon with cruddy moves.

^{Data courtesy of The Silph Road}