Who Would win 

Love Machine

or

XGaster

My Opinion: This could go either way as Both have Abilties that,are just insane and Love Machine has Access to every Account in the world,which could count as close to infinite,but it;s unknown how strong Love Machine would get if he Were to win in the movie. andsense he's shown superhuman abilities i feel if XGaster used the overwrite Ability it just be an endless battle till one loses and as for the hacks well Lovemachines a hacker and,he could get something to even the playng field against Xgaster do to Hacks having those effects and XGaster would need to Finish lovemachine off in his weakest form so Lovemachine won't get any stronger cause having that many accounts on his side would make him,strong as hell and,as for his strongest form well I Don't know if the Overwrite ability would work on him or not so the fight is a draw.