No. There is no chainthrow charizard has except a grab release on Ness. And I doubt "one of the few legitimate chainthrows in the game" counts that. -_-;;It could also be Charizard...
What Demenise mentioned earlier is wrong. I've never heard of it, I then searched high and low and found no information for such thing. Then I just tested it, and it's not a true chainthrow at all. -_-;;