Well, that depends. If you’re looking for a pokémon who can keep up with the both of you while running, pokémon such as decidueye or mightyena might keep up with your luxray, while galvantula’s speed may be comparable to your old infernape’s.
Alternatively, if you’re looking for a pokémon that can provide great companionship to your luxray, mightyena is still an excellent choice that often gets along well with members of the shinx line (despite being canine in nature). Alternatively, your luxray may get along well with samurott (whose general temperament blends well with luxray, despite the fact that samurott is elementally weak to them), stoutland, liepard, zoroark, midday lycanroc, meowstic, zebstrika (if you don’t mind two electric-types following you), and pyroar. Especially pyroar, actually, and on that note, only consider pyroar if you intend on getting a male or if you have no qualms about taking care of kittens.
Alternatively, you could also consider getting a jolteon, seeing as they’re also part of luxray’s egg group.
Bill. What I said earlier wasn’t a challenge. —LH
And? —Bill