One of the more cool aspects of PCC (or frustrating depending on your viewpoint) was that the line wasn't rooted in one singular continuity. One character might appear in a movie universe story, the other in an IDW G1 comic. They were a varied set of characters that just happened to share a play gimmick.
Which brings us to Kakuryu.
If you didn't care about Powercore Combiners, that's a shame, because you probably didn't care about the Takara versions of the toys either. During PCC one of the more popular figures was Grimstone. Grimstone was a Dinobot who's combiner drones were other dinosaurs. He was pretty neat and generally well liked by Transformers fans.
Unlike the Hasbro releases, Takara's version of PCC got a specific story line setting. Taking place around the same time as Operation Combination, various Autobots and Decepticons used the new Power Core Combination technology developed on Earth.
Kakuryu by this time had joined the Autobots and became one of the Dinobots. He took part in the Power Core Combination program and became Grimmaster! Grimmaster being the Japanese version of the Grimstone toy. Grimmaster had several more adventures which lead to his part in helping the Dinobots become Volcanicus most recently. It's not a matter of G1 or Beast Wars. It's all Transformers.