Look how much people across the internet believed the Pokemon Rainbow rumour and you'll have your answer.
I can't believe that anyone would believe that rainbow rumor. Sigh, some people are really stupid.
Well it was partly GoNintendo's and MyNintendoNews' fault even though both of those sites are terrible. They mislead a bunch of gullible people by saying "it's a guy who's gotten stuff right before!" but that was probably BS and they knew it or they didn't know and they just decided to include it anyway. They were still gullible into believing it though.
Here's an article from MNN showing that they would post any crap to get views. Notice how the guy's source is a GameFAQs topic with less than 20 posts (that he the TC also made on 4chan) from September and the article was written in December. They don't give a s*** if a rumour is blatantly fake.