>>31731497Greninja isn't any better if not worse. Charizard at least had two decades to build its popularity and its popularity was natural as a result of children liking it and wasn't a result of marketing.
Greninjas wasn't. It was in smash 4 before its own game was even released, it got a super form, is heavily marketed to the point people don't even know the other two starters of gen 6, and has multiple box tcg sets whereas Chesnaught and Delphox have nothing.
tl;dr Charizard is marketed because he was popular, Greninja is popular because he was marketed.