"They were known as Alphas. Exceedingly dangerous by our standards. Though our Pokemon were adept at dealing with them..."

So he imagines, hopes, the same will be true here. The racers out there will be able to defend themselves. Goodness knows Shadowmaru isn't here with pokemon who are terribly strong... He would have brought Whirlipede if he thought there would be combat here.

"I certainly hope not. But ... stranger things have happened."

It's entirely possible it followed them. After all, one of his Growlithe came from that era. But that wasn't one of the pokemon he'd seen there. Said Hisuian Growlithe even takes it upon itself to give Noibat a few reassuring licks. They are helping! Maybe.