Minimon is probably the closest decent one at the moment but that's still a work in progress. If Little Masters ever comes out I'd snag that, looks amazing.
Not a fan of Minimon, but Little Masters does looks pretty good. I'm still hopinh Micromon is something.
I actually logged on to post a thread wondering where all the pokemon clones were. But then I see this. The so called pokemon clones I've seen though are nothing like pokemon except for the fact you collect monsters and they fight, whether you have control of the fight or not.
If you want Pokemon then get a DS. Seriously there probably won't ever be a game like it that is as good.