You know what I just realized?

[Eucliffe]

I can totally name Reshiram "Natsu" and Zekrom "Laxus" without being at fault. The only problem is I probably wouldn't use either due to my dislike of having legendaries on my team.

/obsession

 

[Zet]

But Natsu is a fire dragon slayer....

 

[Eucliffe]

And Reshiram's Fire/Dragon.

It's better than giving his name to Altaria and Dragonite.

...There's also the possibility of using Igneel's name, but then who knows what Zekrom would be named, since it doesn't seem like there's an electric dragon or not.