Question

Using Lucario and have him use Protect then Aura Sphere then Protect and so on.

Answer 1

Yes, this moveset has been asked before. Thats an excellent strategy! DT first Suggested it on this site!

Answer 2

As long as you use protect when he attacks then yes it is a great strategy.

However what might be a better combo/move-set would be to use Lucario with protect and focus punch because his base Attack and Special Attack are close enough that using focus punch would be a faster KO.

Answer 3

Http://pokemondb.net/pokebase/5893/slaking-help

this is essentially the same question as yours.