Undertale finale starts

Indeed

That copy of Green is unfortunately fake.

This is like the Chaos Emeralds. The Chaos Pokemon!

Oh, it looks like I have a contender for who has the most random six peculiar items with different colors

If you're somehow not joking... Those are the Generation 1 and 2 Pokémon games, including (a fake copy of) Green, which only released in Japan. Also, you miscounted. There's 7, not 6. Red, Green, Blue, Yellow, Gold, Silver, and Crystal. (Although, why they didn't include Generation 3's games (Ruby, Sapphire, Emerald, FireRed, and LeafGreen) when they already have a GameBoy Advance, I don't know...)

I just have little replicas of the Chaos Emeralds

I could tell, given the Eggman plush.

oh, i own all of those. green is just something some guy gave to me.

"seven."
- Undyne the Undying