Question

I want to know the power of my gastradons hidden power.

Answer 1

There is a man in the building next to Veilstone Game Corner (where you get prizes). He will tell you its type.

The power will be between 30 and 70 but there isn't a way to tell that currently. (There is a complex formula to work it out from the IVs if you know them.)

Comments

It has a queit nature and "likes to thrash about". can you figure out its power forme?

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No, both type and power are based on IVs. Check Bulbapedia.bulbagarden.net for details