Pokemon-go – Why two Zubats with same CP has diferent CP bar

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In the following screenshots I have two Zubat pokemons with same CP, can someone explain why the CP bar is not in the same position?

CP 154, lower bar
CP 154, higher bar

Best Answer

This is because the IV for these two Pokemon are different.

IV Calculator

Perfect IV's means that a pokemon has the best possible stats for its species, and therefore, has the potential to reach the highest possible CP for its species. For example, a low IV pokemon might top out at 2700 CP at max level, but a pokemon with higher IVs could reach 3000+ CP at max level.

Read more about IV here