Scammer Selling Flash Coin | A type of Coin That will Disappear in 6 months | What Is This?

Now, I am confused.

As the title says, the person (confused about whether he/she is a scammer) asked me if I would like to buy Flash BITCOIN (yes, Bitcoin. Not just any coin). Flash Bitcoin is a form of Bitcoin that will disappear in 6 months. First of all, why would I buy this kind of Bitcoin? Unless I want to scam people or trade on exchanges and make money. That would be like fake currency. But is that even possible with Bitcoin? I don't think fake Bitcoin will work. It can't.

Then the next question - why sell such a thing? Probably looking for gullible buyers. The asking price was further hilarious. Pay $ 250 worth of Bitcoin to get $ 5000 worth of Flash Bitcoin. Mannn!!

And the penultimate part - is this person a scammer? If he/she has already told me that the Bitcoin would disappear in 6 months, then he/she probably is not scamming me but giving me the actual picture. What is this then? Some sort of trickery that I have to use (or can use)?

The last part - even if I don't buy and others do, will we end up with a system having fake Bitcoins? Is that possible?

Thoughts, please? I am sure this is a valid discussion that may affect us.