That just not true. Right before the summer event people could hunt megas (poke with the option of mega evolution) I think it was (maybe it was something else they had to hunt, but it definitely was a "hunting event) and show them to a certain npc and the price for first place was a summer poke with right nature and ability, just random ivs. How is that any different? It was tradeable, I should know, because I bought one of those summer poke. Event pokemon have more value than pink, because you can mostly only hunt them once a year.
Sorry, but I'm just not "buying" it.