Decepticon Matrix

The Decepticon Matrix is a big fat lie in the Generation 1 continuity family.

There's no such thing as the Decepticon Matrix.

Fiction

Animated continuity

Some time after Unicron was destroyed, the Quintessons convinced the Decepticons that they had the Decepticon Matrix and would give it to them in exchange for helping them invade Cybertron. Of course, they didn't, because there's no such thing.

From Teletraan I: The Transformers Wiki, a Wikia wiki.