Hey, nice team. You said that you wanted a pokemon that could counter threats such as Heatran, Lucario, Infernape and Gliscor. LO Aerodactyl checks all of these threats and breaks stall with Taunt and Roost. Check it out in smogon.com/dp/pokemon/aerodactyl. I use him on my team and it's great! I suggest you replace it for Gyarados. Good luck with the team!