When Charizard got his leg hurt and wings tired, he gave up. Nearby, Charundurus was laughing because he had neither wings nor legs, and he worked better than Charizard. Then the Charizard said that a Pokémon would have grand wings, which never got tired. He said if not, then a Pokémon would be strong as Charundurus and have no wings or feet as well.
Here is what he exactly meant:
A fusion of Unfeazant and Pidgeot or a fusion of Electrode and Solrock.