>>28633554This is the first I'm hearing of Deerling, but a quick look on Bulbapedia would suggest that, while you cannot access each form with gen VI, they retain whatever form they were when you obtained them in V. The forms were not changed, just the method to obtain them.
Spiked-Ear Pichu was a unique Pokemon that couldn't leave its cartridge. It couldn't even be traded from a copy of HG to another copy of HG. Cosplay Pikachu is in the same boat: a unique individual for its cartridge. We don't know enough about Eternal Floette to make a judgement on it, but it might also be in the same vein. The key thing to bear in mind about all of this is that these are unique individuals gifted to the player and, this is important, cannot leave their game.
One other major difference between all of these ones mentioned is that these forms cannot be changed. They're static and permanent to the Pokemon in question. The exception being Cosplay Pikachu, but in its case we could say that "Cosplay" is the form, and each subset it can become is just a property of what the individual can become. This breaks one of previously establish criteria of "doesn't change the actual Pokemon" which was said to be what makes removing megas soooooo easy. If you were to remove these Pokemon "forms" from the game, as was the case for the Pichu, it cannot go to the next generation, but if you remove megas from the game then there's still nothing preventing you from sending any of the mega-ed Pokemon to the next generation. In short, your short list of "removed" forms are not equivalent to the removal of megas.
