Why exactly is Dual Chop a Dragon move?

[PageEmperor]

I looked up to see the names of Dual Chop in other languages, and none of them hint on why exactly it’s a Dragon typed attack.

Like, it’s boggled me for so long, what exactly is ‘Dragon’ about a move that is basically karate chopping the opponent twice? Shouldn’t it be a Fighting move or something? Does… anyone else seem to know any real explanation to this?

 

[Toronbo]

In BW the only lines that could get it were Haxorus and Garchomp, i'm assuming it's a dual chop because of the two axe heads on Haxorus, then they gave it to Garchomp because it also has some big arm wing blade things going on. B2W2 opened up the availability way more.