I never really knew what a "bashful" nature was supposed to be.
What, do they bash people over the head a lot?
I have a decent vocabulary, but i've never ever heard the term bashful being used outside of pokemon. (And yoshi's island)
(Well, a friend told me it just means someone who doesn't want to be seen with no clothes on, but that's pretty obviously not what it means( --- Official Rayquaza of the Pokemon X and Y boards I like a lot of things. Like Pokemon. And Sonic. And Kirby. And Smash bros. And Coca cola.
Fun fact: in Emerald version, back animations are influenced by nature. They influence the speed of the back animation, as well as whether the animation happens twice in a row. Try getting a few Pokémon of the same species in Emerald and switch between them, and you'll notice subtle differences between some of their back animations. I wouldn't mind it returning in some form (assuming that they'd still be able to do this with 3D models without running out of space), because I thought it was pretty neat.