dolphin pokemon when?
and no; orcas and anglerfish are not dolphins
kangaroo pokemon when?
and no; kaijus and mushrooms are not kangaroos
shark pokemon when?
and no; torpedos and dragons are not sharks
But orcas are dolphins you fucking retard.
Specifically speaking, all marine mammals are descendants of a singular common ancestor species that's not even that old in the grand scheme of life on Earth.
You're all splitting hairs here on whether or not one of several cousins is closer related to one closer related group of cousins or another