Yeah I really love using mine against some of them with Powerup Punch, it wrecks their shields so easily! Do you plan on using 3 Lucario in those fights?
For fights in gyms or Raids where Fighting-type attacks are good it prefers suggesting my Machamp.
It is definitely an awesome Pokémon! I cherish my first one so much as I got it from an egg from a gift last year from a friend who has Lucario as one of her 6 favourite Pokémon. I was quite shocked my first Riolu hatched from an egg I got from her, and super happy at the same time! :D