I just saw that 2 od my pokemon are infected with pokerus
i read on the internet that i can spread it by putting the infected in first slot and the clean in second slot and then do 5 random wild battles right?
is there a way that i keep the pokerus and it doesnt get removed at midnight? (I read that every midnight the pokerus gets deleted)

Infected Pokémon can be in any slot.
There's a random chance it will spread. 5 random wild battles should do the trick. Hell, one random wild battle could do the trick.
Pokérus doesn't get removed at midnight. Seems like mine haven't lost Pokérus after having it over a week. But to be safe, infect and store a Pokémon with the virus in your PC.

you do lose pokerus at midnight you just hafta put it in a box and it will keep it

nice 2 bad my team is already lvl 100 so it doesnt help them at all right?

It does if you use reset bag and max out on proper Effort Values!

will this make my pokemon stronger?? because i read that EVs only apply when u level up right? but since they cant level up anymore...

you would be fine if you reset bag them and yes it would make them stronger if you ev trained them right