You only get to play the original Metroid in MP if you beat Metroid Fusion and usethe GBA/GCN link. It has no connection to beating Metroid Prime or saving the game at the end of Prime.
And you can play the original Metroid on the GCN in all countries (that has MP and MF anyway) as long as you have beaten Metroid Fusion, a copy of Metroid Prime, the GBA/GCN link cable, and of course a GCN and GBA.
*shrugs and walks away*
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