>>48258855lol of course not, what kind of game do you think pokemon masters is.
In every appearance he's made outside of the recent anniversary event he has Zekrom, which seems to be what the masters developers think he's supposed to have in the source games. However his anniversary form also has this bit of dialogue that might suggest that this version of him had Reshiram somehow. I don't think the Masters devs really care much about these things.