Good catch, didn't think about Fire trainer before. Considering the success of the game, that might be a good call.
Yeah, it's kind of a cross-promotion thing. Using Smash to advertise a current fire emblem character seems to have done 3 houses some good. (If Amazon hourly charts are anything to go by.) If Nintendo wants to give 1 of its IP's a shot in the arm, getting Smash representation seems to be a good way. If they want to push RFA in a few months time and I think they do, Smash would be a perfect way to keep it in the publics' perception.
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In my opinion the N64 was not just the best console of the 5th gen but, to this day the best console ever created!