going over my first thought to use trashalance garbodor with luxio/ luxray. iv'e been thinking of more of the mirror match and came up with some fun little tech cards...
Luxray Break: 20 more hp, and a fun finishing attack, if you can get the energy onto him.
Promo Giratina: if your against another luxray deck. they might have luxray break. consider this card to completely wall them.
Stunfisk from shining legends: its a fighting type Pokemon, so you hit for weakness, and only worth 1 prize card, and all its attack costs need lightning energy. also paralysis on a coin flip and doing 30 is super annoying as a stall tactic. against luxray, your still doing 30, even with weakness, because the ability negates 30 damage. we all saw how a froakie won a match at worlds this year by getting bubble hax and decking the opponent out.
Lycanrock GX from guardians rising: fighting type, to hit for weakness. with blood thirsty eyes your basically replicating how the original Luxray GL LV. X worked with flash ray by bringing an opponents bench Pokemon active. playing this card will mean switching your decks energy to fighting energy. good thing luxio needs colourless to attack.
Tapu Koko GX. if you have enough energy on the board you can drop a koko and go to town.