Speficially talking about hidden values of IVs and EVs (well, latter until X/Y). IVs and EVs are the underlying mechanics to a Pokemon's stat along with base stats (obviously) and nature. They have gone through changes throughout the franchise's history, especially early on, and are important when it comes to competitive battling.
Want to know what I'm talking about? Just take a short look at these Bulbapedia articles:
IV: https://bulbapedia.bulbagarden.net/wiki/Individual_values
EV: https://bulbapedia.bulbagarden.net/wiki/Effort_value
Did you know about this? If so, what do you think about these game mechanics? Or more importantly, do you even care about it in-game?
Want to know what I'm talking about? Just take a short look at these Bulbapedia articles:
IV: https://bulbapedia.bulbagarden.net/wiki/Individual_values
EV: https://bulbapedia.bulbagarden.net/wiki/Effort_value
Did you know about this? If so, what do you think about these game mechanics? Or more importantly, do you even care about it in-game?