I don't think so. There is only the blue eyes ultimate dragon that you can fuse 3 blue eyes to get.
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Yes you can fuse Pokémon however this is only possible in Pokémon Black 2 and Pokémon White 2. Using the DNA Splicers, you can fuse Kyurem and Zekrom to make Black Kyurem and Kyurem and Reshiram to make White Kyurem.
There is no known way to get zekrom in white 2.
Well it all depends on what you feel is best. Blue Eyes White Dragon is good for beat-down and simultaneous fusion summons of both F.G.D. and Blue Eyes Ultimate dragon, pretty much beat-down itself. Red Eyes Black Dragons are more complicated, because it depends on which Red Eye compilations you are using or generally like. A different approach from this is Blue Eyes White Dragon is a better card if you want to compare it to the normal Red Eyes Black Dragon. Blue Eyes White Dragon is searchable with White Stone of Legend. Combined this with Card of Consance which discards a dragon tuner, (the White Stone of Legend), you get to draw 2 cards. And now with Trade-in (Level 8), you can discard that Blue Eyes White Dragon for another 2 cards. The normal Red Eyes Black Dragon is not worth playing anymore. If you want to have a good dragon deck with a good drawing engine, use Blue Eyes White Dragon, and The White Stone of Legend.
there is more than 1 fuse box and theres 2 in some rooms and 1 in others.
You can only get them in the Black & White, Black 2 & White 2.