Unfortunately, unless the person showing off is uninformed about the level 1 Sinnoh dragons and is requesting that, the game won't let you trade away a level 1 of something that it knows doesn't exist (such as Zekrom). --- [Este mensaje fue borrado al deseo del dueno]
You can't put badly hacked pokemon in the GTS, so that wouldn't work.
Fixed that for you.
You very well can put pokemon created with external programs (aka hacked pokemon) into the GTS. All it checks for is to make sure it has a legit movepool and stats, and a couple other small things that are inconsequential. I think it may check for level for certain pokemon.