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Which good sandshrew to evolve?
One with 70 HP and 700CP, certainly caught her attention; the other with 71 HP and 685 CP, above average.
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well... the best use for Sandslash is for training against fire or rock pokemon, so you want a low CP. Since attack contributes more to CP, and since Sandslash has lower base stamina than base attack, getting a Sandslash with low Atk IV and high Stm IV might be preferable to balance its stats a little bit. I haven't done the math to know for sure, but it could improve your survivability without raising CP as much.