Hey
Next, I think that making Metagross your lead over Togekiss will greatly benefit your team. Basically switch the position of Metagross and Togekiss. To be honest, I do not see how effective your Togekiss is as a lead because the vast majority of leads such as Jirachi , Swampert, Metagross etc, are bulky enough to not be OHKOed by any of Togekiss' attacks (Air Slash, Aura Sphere) while they can set up Stealth Rock and hit you back hard with the proper move. In addition to that, some leads tend to use Focus Sash meaning that Pokemon such as Azelf will always beat you. In addition to that, Azelf tend to carry Taunt meaning they will prevent you from using Thunder Wave to cripple them. If you Thunder Wave, it will Taunt and then survive your next attack with Focus Sash and Explode on you. If you attack right off the bat, it will still set up Stealth Rock and then Explode. Togekiss is a valuable member of your team, and you should keep it alive until the late game where it shines best.
Lead Metagross is usually better off holding some type of berry such as Occa Berry and or Shuca Berry. These pinch berry allow it to survive a super effective hit from an oppposing Pokemon. Most leads will not damage you directly straightaway anyway, meaning Leftovers will generally be a waste of an item since Metagross has more use for one of the aforementioned berries. Having used a Metagross lead extensively myself, I feel the best version of a lead Metagross is one holding Occa Berry with Earthquake / Bullet Punch / Explosion / Stealth Rock. So basically, I would recommend you change to Metagross as your lead with Occa Berry. Earthquake is over Meteor Mash and I will explain why! The reason for this is really because when you look at the top 10 leads used in OU, this Metagross can effectively deal with the vast majority of them, even if it does not have Meteor Mash. Here is a rundown of what it can do against common leads. Against opposing Metagross use Stealth Rock first, then Earthquake. If it turns out to be one without Earthquake, you're in luck since it cannot beat you. Against Azelf - It will SR first most of the time, and you can kill it with 3 Bullet Punches (2 if it chooses to use a -Def nature). This is the only lead against which Meteor Mash is better off, since it allows you to Meteor Mash it then finish it off with Bullet Punch. Infernape is fun since you survive its Fire Blast with your Occa Berry and then hit it with Earthquake to bring it to its sash and finish Infernape off with Bullet Punch. Versus Jirachi use Earthquake to 2HKO it. Versus Aerodactyl - Bring it to its sash with Bullet Punch, then finish Aerodactyl off with another Bullet Punch. Against Tyranitar - Earthquake does enough to 2HKO, and you out-speed and survive its Earthquake, meaning you win. There's also no chance of you missing like there was with Meteor Mash!. Against Heatran - You survive its hit with Occa then hit back with Earthquake to take it out. So basically, not having meteor Mash is not to big of a deal since Bullet Punch does most of the things Meteor Mash does with the addition of giving your team some form of priority move. For an EV spread, use 252 HP / 236 Atk / 12 Def / 8 Spe. The Attack EV's allow Metagross to hit as hard as possible with BulletPunch/Earthquake/Explosion while the HP EV's give Metagross some durability.
Now, your Tyranitar set is outclassed by Dragon Dance Tyranitar version since 1) Tyranitar still gains a Speed boost 2) In addition to the Speed boost, it gets a boost in Attack, allowing it to hit harder and pose more of a sweeping threat. Dragon Dance Tyranitar is a very potent sweeper that is capable of sweepng through many teams with ease. In addition to that, most teams only have one answer to DD Tyranitar and that is Scizor who can be beaten by Tyranitar is said Tyranitar is carrying a Steel resist berry. The Steel resists berry allows Tyranitar to survive Scizor's Bullet Punch and destroy it with Fire Punch. With Stone Edge and Crunch in Tyranitar's arsenal, Tyranitar will have little trouble sweeping since Tyranitar has a myriad of chances to set up a DD. It can come in on a Rotom, Jolteon, Zapdos, etc, set up a DD, and sweep. If you are interested in using Dragon Dance Tyranitar, I suggest using Dragon Dance/Fire Punch/Stone Edge/Crunch, 252 Speed/252 Attack/ 6 HP, Babiri Berry ( Steel resist) with a Jolly Nature. Dark and Rock provide the Tyranitar with the amazing dual STAB combination of Dark and Rock which give Tyranitar excellent coverage. Fire Punch helps to finish of the coverage given by the set since it hits teel types such as Forretress, Lucario, and perhaps most importantly Scizor, one of the biggest threats to Tyranitar. Jolly allows you to reach 364 Speed, which allows Tyranitar to beat everything that reaches 115, including Azelf and Starmie. Babiri berry, allows you to survive Scizor's Bullet Punch and will deal a minimum of 53%. In return, you OHKO with Fire Punch.
Next up is Celebi! Now that I suggested Tyranitar having Dragon Dance, Swords Dance is less needed on Celebi so we can now focus on what Celebi does best, wall! Celebi is one of the best walls in OU since it is capable of dealing with threats such as Gyarados, who your team is quite vulnerable too. Now, lets start off with fixing your moveset. Firstly, Grass Knot is better than Energy Ball in OU. Grass Knot gets a harder hit on Gyarados and Tyranitar and Bulky Waters such as Suicune,who have the potential to beat celebi who do not carry Grass Knot. Secondly, use Recover over Swords Dance. What makes celebi such a potent wall is its ability to instantly heal damage it has taken with Recover. Without recover, you will most likely lose against Bounce Gyarados, CM Suicune, etc. Now, use Thunder Wave, in place of Baton Pass. Thunder Wave allows you to cripple Pokemon such as Infernape and Scizor who love switching into Celebi. Thunder Wave cuts Infernape's and any other Pokemon that switches in on Celebi in half. This is very helpful because it means your Tyranitar will be more likely to sweep once things are paralyzed. Now for the fourth move, it is a choice between Hidden Power Fire and Leech Seed. Since your team is pretty vulnerable to Scizor's U-Turn, I suggest using Hidden Power Fire over Leech Seed. Hidden Power Fire allows Scizor to take care of one of Celebi's worst enemy's, Scizor! HP Fire will hit Scizor for hard damage, allowing one of your other Pokemon to finish it off. Now it is time for Celebi's EV spread! Use 252 HP / 220 Def / 36 Spe with a Bold Nature. The EVs give Celebi the best overall tanking ability it can get while still outrunning Jolly Tyranitar, which means you can Grass Knot it before it hits you with Crunch. Bold lets Celebi take Physical hits more effectively as well since Bold boost Celebi's Defense stat.
Good Luck! =D
