why def and spdef of vullaby are highlighted while vulpix isnt?

The colors show which stat the nature of your pokemon increases and which it decreases. In this particular case, your vullaby has a gentle nature, which increases the special defense of the pokemon and decreases it's defense stat. The vulpix has one of the neutral natures (Bashful) which doesn't increase nor decrease any of the pokemon's stats

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why def and spdef of vullaby are highlighted while vulpix isnt?

 

Hi @tho1234

 

I'm sorry for the inconvenience.

I would like to inform you that a Pokémon's Nature affects the value of two of its stats, increasing one by 10% and decreasing another by 10%.

On PRO, the green one are the one increased by 10% and the orange are instead the one decreased by 10%.

There are a total of 25 Natures and each one of them is different and increase/decrease stats in a different way, except made for 5 of them that instead do not affect the stat of the Pokémon in any way (not positively and not negatively) and Eevee is the exampel of that.

You can find further information on BULBAPEDIA - NATURE

 

I hope the information given provided some clarification, please let me know if something is unclear and if you have any further questions.

Have a wonderful day!