Ooooh I got a secret for you! 😎

[JohtoVeteran]

Pokémon secrets all over each region and they usually concern legendary Pokémon. HOWEVER! MANY Pokémon have secrets of there own...😲!? For exsample. Wobbuffet and it's tail, as the pokedex entry from B/W2 goes "It desperately tries to keep its black tail hidden. It is said to be proof the tail hides a secret." There seem to be unanswered questions just going by pokedex entries.
What are some interesting "secretive" or "mysterious" pokedex entries you've seen? And what's maybe a theory you can think of what the it is?!

 

[Nah]

There's Zygarde:

When the Kalos region's ecosystem falls into disarray, it appears and reveals its secret power.

What exactly is this "secret power" though? Why is it related to the ecosystem? Though I imagine we'll find out in the next Kalos game(s).

 

[Sun]

There's Zygarde:



What exactly is this "secret power" though? Why is it related to the ecosystem? Though I imagine we'll find out in the next Kalos game(s).

I'm sure it's referring to those secret yet not so moves. >:)

One of the biggest mystery is Jynx, she doesn't have pair of feet (at least according to the standard of games).

Oh and then there's the Diglett line, whose bodies aren't revealed yet.