Pokemon-go – Does a pokémon stay perfect when powering up

Pokemon do not "move" in GO. Once they spawn in a location, they tend to stay there until despawn.

Pokemon have an attribute which controls spawn behavior (likely TimeTillHiddenMs and ExpirationTimeMs in the protobuf files), which determines their spawn length. For the most part, Pokemon will despawn either 15, 30, or 45 minutes after initially spawning, although some outliers do exist as this is a server-side variable.

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.