6th Gen help

I'm playing pokemon and I need help.
I need one more pokemon on my party but I don't know which one
This is my team

https://richi3f.github.io/pokemon-t...rd-mega-x+heracross+suicune+gardevoir+bisharp

I think snorlax

If it's XY I'd say Golurk, it was incredibly helpful for me in my playthroughs for those games with high attack power, and solid bulk

If it's ORAS, I would say Glalie/Walrein/Manectric would help balance out your team quite well as well as Illumise/Volbeat, Exploud and Medicham would be some fun options too