I'd say it's a coincidence
Well first off Reshiram and Zekrom are actually based on Yin and Yang from Chinese Philosophy.
You aren't the first one to try make a connection between Pokemon and Yu Gi Oh - heaps of people have, during 2010 and stuff.
However, it seems to me, the likelihood is this is a simple coincidence, which is a view echoed by alot of people through forums like here, here and here
I don't think they resemble each other too much. There are some features like their tails, and Reshirams arms/wings. And the minor detail that Zekrom glows blue.
Probably a coincidence.
They already had the whole yin yang motif goin on, and we all know Game Freak loves them some dragons.
A Black Dragon and a White Dragon acting as counterparts isn't exactly the most uncommon idea in the world.
it is somewhat there, but I dont think they were the inspiration, in my opinion.
Not really, no.
Yeah, old, and quite farfetched imo. There are a lot of white dragons and black bipedal creatures in fiction.
While their eyes and skin color match, their other features aren't very similar. Like their body structure and such. Plus, Reshiram has crotch fur while BEWD has none
Yeah, they're a bit similar, but that doesn't mean they're actually rip offs. Probably just a coincidence.
To be honest, I see very few similarities between the two besides color. The differences in general appearance should be easily distinguished between both Reshiram and Zekrom to the Yu-gi-oh dragons shown. Notice how Reshiram and Zekrom have softer coloring, rounder lines, less intricate features, and a much less intimidating demeanor? In fact, they look rather cute in comparison to their Yu-gi-oh cousins. Hell, Blue Eyes White Dragon looks like it could tear the world in two and call it a day, while Reshiram gives a baby a cigar burn and wonders why the hell it's a deity.
Anyway so like I said, it's more likely it's a coincidence rather than a ripoff.
As some of those above comments have said there are actually quite alot of cases of a Black and White dragon counterpart, as those two colours often correspond to notions of 'evil' and 'good', making them a staple in many fantasy games, novels and myths.