Is it worth more to evolve or upgrade Pokemon? Should I spend on upgrades or save for evolution?

I am new in this game so I can't understand what is more worth evolution or upgrade? I have Charmander as a starting Pokemon and I upgraded it 2 times. Is it worth to save for his evolution?

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2 Answers

When you level up your trainer you will find pokemon with higher CP. This means next time you find a Charmander you will have a better chance of it having a higher CP than the one you started with (eg I recently found a Squirtle with 198CP). So saving candies and stardust for a higher level Charmander would be better.

Adding to Kiwi's answer: The CP gained by a power up is influenced by the stage of evolution. A maxed out Pokemon like Charizard or Hitmonchan will get more CP per Powerup than a Charmander.