Ok i'm just gonna make this quick. MS/Mechtanium Surge never aired in Japan, it "was" replaced by the Japan exclusive BakuTech series. Now it is proven that a Japanese dub indeed exists, possibly for all 45 episodes, or at least a few. In addition, there are episodes using 16:9 aspect ratio I guess?
This video posted above is interesting. It is a Vietnamese dub, but if you listen closely - it's a Vietnamese voice actor dubbing over the Japanese dub which was thought to not exist.
I think MS was going to air but they scrapped it and aired BakuTech in its place. Would we be able to get our hands on rare Bakugan like Krowll?
https://www.dailymotion.com/video/x5wvm98 Japanese dub exists for Arc 2 of MS as well, but once again it is Vietnamese voice actors dubbing over the Japanese version.