Pokémon: Yellow Version is part of the first generation of games within its famous series, whereas Pokémon: Silver and Crystal Version are part of the second generation of the Pokémon franchise. They were developed by Game Freak and published by Nintendo in North America in 1999, 2000 and 2001 respectively. In this journey, the player encounters various monsters, which they can catch to use for battles, or just to fill up their Pokédex.
In this run, gabraltar fills the Pokédex without resorting to any glitches and obtains the diploma in all three games in less than seven hours. Note that Mew and Celebi aren't caught here; this is because they can only be obtained through either an event or glitches.
The downloadable encode features additional audio tracks: The first (default) track features audio from the three titles, while the second, third and fourth tracks feature audio from Crystal, Silver and Yellow, respectively.
There's also an alternate encode provided by the author which features commentary and a detailed overlay.