Evolving your Pokémon in Pokémon GO applies an exact multiplier to its base stats while preserving its level and IVs. Before spending rare candy, predicting the evolved CP ensures your Pokémon stays under league eligibility thresholds.
Understanding Evolution Multipliers
Because CP depends directly on Base Attack, Defense, and Stamina, evolving a Magikarp (Base Attack 29) into Gyarados (Base Attack 237) results in a massive CP increase (approx. 10x to 11x multiplier).
Preventing League Over-Cap Errors
Always check your Pokémon's expected evolved CP before evolving to prevent accidentally crossing 1500 CP or 2500 CP thresholds.