Originally Posted by Calypso
I assume you're referring to Charizard/Squirtle, since you didn't really elaborate.
Ambipom, however, isn't really comparable to either. Both were much more popular, members of Ash's original six, and the inital starters; it's pretty much a given that they would re-appear.
Yeah, but I still reckon that the other released Pokemon would still have a chance.
Oh yes. Remeber Butterfree? It still hasn't reappeared despite being part of the original 6 and the separation was so tear-jerking...