My pokemon of choice for alteration will be Luxray, and these are changes i would make
1. For starters, give Luxray Energy Ball/Grass Knot for ground coverage, before you dismiss it on the ground that Luxray isn't grass type, hear me out, my justification is that Vulpix/Grumpig/Girafarig etc also get Energy Ball/GrassKnot, and Luxray lives in the wild, it can derive energy from plants. It can be bred into Luxray as egg move
2. Ability wise give Luxray Competitive for special attack variant of Luxray(95 special attack is actually decent enough to work around), plus it complements forementioned moves
3. Give Luxray 10 point for its much desired speed stat, allowing it to at least outspeed some of its major threat.