Okay, let's do this one bit at a time: Counting Pokemon Trainer as three reps is silly, one spot on the select page = one rep. Zamus isn't her own Rep, nor is PT 3 reps.
Pokemon, as a high selling series, should have 4-5 reps, easy. We have Trainer and Pikachu. Puffy and Mewtwo are pretty safe returns. That gets us 4 reps. Now, I'd push for second and third gen playable reps, but there aren't that many options. Also, games pull from earliest and latest, not out of the middle. The only really likely exception would be a return of Shiek, who is not from earliest or latest Zelda, but is from one of the more loved Zelda games.
Now, Lucario is known, easy to write up, and doesn't pull an unbalanced rep (like putting in Infernape without Turtwig and a Piplup form as playable). Now, I'm sure not everyone wants or even likes Lucario, but he's got a fair shot now that Deoxys and Gardevoir (the other good contenders) are confirmed in Pokeballs.