I a recent disagreement, a friend and I are trying to determine whether or not
Metamorphosis can be used to summon Dragon Maaster Knight.

Forgive me if I posted this in the wrong place.........and for posting this twice >_<

No you can't.Dragon Master Knight can only be special summoned by fusion summon.Thus,like e-heroes,they can't be special summoned with Metamorphosis.

When a card says in its card text: This monster cannot be Special/Fusion Summoned/Normal Summoned/Tribute Summoned/Set Summoned except by That means if the summoning requirements where not met you can not select it to summon.

Thank you very much for the help.