>>15479080Two days ago I think, an anon made a post leaking all the Dream World artwork from the PGL website. Every Pokemon who had a Mega Evolution had a placeholder image appearing the same as their normal final evolution. (Example: Charizard having two placeholders for X and Y Megas).
Floette had multiple artwork for each of the colored flower forms and one placeholder image. Anons speculated that the placeholder might be AZ's Floette for a future DLC-distribution.
Anyway, my point in all this is, since the AZ Floette was confirmed, it's likely the rest of the placeholders are all valid forms. And none were found for possible Mega Evolutions for Pokemon we didn't know about.