In order to do that, you'd have to get someone to essentially hack the game. If you want manamon legitimately in your new game which aren't available naturally, the only way to get them is to trade for them.
But there's a silver lining to this cloud. You don't need to mess with port forwarding if you aren't the host. All you need is the IP address of the person who is willing to host the trade. I know because I've done this several times now. As long as you have their IP address and can hop on when they are, you should be able to trade with them. You can't host, but it won't matter.
There was a user not too long ago named Ethin who essentially used tools to edit his manamon's levels and stats and all that. That was basically cheating. And to inject manamon into your save file which weren't there to begin with would need a lot more of the same. Needless to say, I'm like 99.9% sure this forum is not going to sanction that in any way, shape or form.
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