While Luke trains Rey (Yoda style) to be calm, at peace, passive, let go and face everything she fears to lose or confront.
Snoke trains Kylo to cling to all his fears and insecurities, and when he doesn't get his way, use the powerful art of the
tantrum!
That is some cosmic level s----!.
LOL, sorry unless Kylo gets yet another new deus ex machina level power upgrade we conveniently haven't heard of yet, Kylo doesn't stand a chance against her.
I think in the end theirs shouldn't be just the physical battle (other than for a brief action scene to show off his new,
new powers) , but ultimately a mental one, where the only way to "defeat" her will be to sway her to their side.
Convince her however briefly, that Luke betrayed her. That is where Kylo(and whatever damage they did to him)'s chances lay.