I actually don't know how many do, but usually the type would be "Psychic" Pokemon? Though, it's not for sure guaranteed that all of them would be able to talk to you like that either...

[ So, luck of the draw? Like how that Guardian communicated to them -- which Keith wasn't here for either, but yeah. ]

...Well, it would be weird to just call your Pokemon 'Thing' or 'It' all the time, right?