Nice team dude. However, as you mentioned, Infernape is rather annoying. Surprisingly, Hitmontop is a good counter and can fit your team well as it has pretty good synergy with Tyranitar and Reuniclus. I suggest replacing Gliscor with Hitmontop. With access to Intimidate, Hitmontop can lower opposing Infernape and Terrakion's attack stat making it easier for Hitmontop to take the hit. Hitmontop can come in on any of Infernape's attacks and not be OHKO'd. Then, just use Fake Out since it has +3 priority and then finish Nape off with Mach Punch. Same thing with Terrakion. TechniTop would be the set to use as you need the attack damage to be able to kill Infernape.
Hitmontop @ Life Orb
EVs: 252 HP / 252 Attack / 4 Defense
- Fake Out
- Mach Punch
- Close Combat
- Sucker Punch / Stone Edge
The last move really depends on what you want to hit, but 3 priority attacks can actually really help you out. Sucker Punch can eliminate Celebi and the Lati twins who are pretty common switch ins. Hope I helped dude.