I think you shouldn't reveal it yet, i like a challenge :D
But I think I have it. Probably not...
It's Gothitelle!
I am the third of a trace, only incidentally. 3rd evolution, 3rd pokemon family to have frisk as an ability
But least I with eyes I do stare intently. It's got some pretty intense eyes that look into the future
Depending on your choice, Did you choose black, or white?
you may hear my squeaky voice, it's cry is kind of squeaky?
and get to know my feelers. The ribbons on it's head are feelers
The invisible is visable. It has a footprint with no legs
Y is rare, but know this. males are rare
Black or white, I am neither, I am something else. Black and white? And by something else its like a spirit?