The Pokémon that would say he "needs no introduction" and most of Reborn knows [s]and loves more than me ;~;[/s]...
[b]Ássos![/b] (Lucario)
The most famous Lucario on Reborn, Ássos adopts a bit of personality from his owner (me) but mainly sticks to his own ways. He's a bit sarcastic at times, much like myself, but he never intends to hurt anyone...most of the time. [spoiler]He talks to me like I do to Squid/Amethyst[/spoiler] More than anything, Ássos is protective and friendly, even parenting at times, a la shielding Amor from the crazy immaturity of Reborn. He seems to often be with the often heard "Baker of Reborn" who apparently has a mysterious past, but that doesn't stop him from having fun with the rest of Reborn. He also is an avid fighter, and is kind of pissed off at me right now for not using him in any of my 5th Gen teams, bar the league team. In short, Ássos is a Lucario who loves to joke, but even more than that loves to be friendly and just have fun.
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No other cameos necessary at all. If you fit me in at all with Ássos, I'd love you for eternity.