Is this a change in Fly mechanics?

Question

My Hawlucha was in the 'invulnerable' stage of Fly when a Swalot used Toxic AND IT HIT. So now my Pokemon is badly poisoned. I'm pretty sure that didn't happen in previous games, so is it new to X and Y?

Answer 1

I know answering your own question usually isn't the done thing, and this question is a little old, but I have just found out the actual answer, and the current answer is wrong.

As of X and Y, if a Poison type uses Toxic then it cannot miss, and will even hit during the invulnerable stage of Fly or Dig.

Source