First of all, I would say this is a pretty good team for the one who just started playing OU. But, As Muguet commented above, many pokemon are UU or lower. Just like you may be, I really want to use my favorable poke's in OU, but you gotta follow the meta.
Aggron:
Personally I wouldn't really suggest using this guy as mega, where ground type mons like landorus, garchomp, and excadrill are everywhere. Also, if Magnezone with Magnet Pull ability traps your Aggron, it will be worn down quickly due to its relatively lower Sp. Def.
If you wanted tank much better options will be Tyranitar (personally think the most efficient with Choice Scarf), Hippowdon, Mega Venusaur (has only 2 weaknesses - Flying & Psychic - thanks to Thick Fat), Ferrothorn (can be devastating for teams without check moves against it), etc.
Suicune:
I compliment on choosing this guy as a wall. Despite being in UU tier, this mon is literal cancer in some occasions. All you need is another source of healing, which is rest. You can place Tailwind with rest. Replacing Calm Mind with Sleep Talk allows Suicune to function with momentum, but if you want to sweep as a tank, keep Calm Mind in exchange of inability during 2 turns of sleep after rest.
I understand Suicune has way better bulk than many other tanks, but I am now using Milotic due to its ability to heal with the move Recover while not immobilizing itself.
Volcarona:
I'm sorry but I wouldn't suggest using this guy either. I know it has enough special bulk to set up, but heres why. When you start playing OU, you will see people going so f*cking crazy trying to set up entry hazards, and the most prominent and cancerous one is Stealth Rock, which cuts down Volcarona's HP by half one the entrance. Even if you set up well with Quiver Dance, you have to back off against Heatran, Volcanion, and mostly, Talonflame. Once you back up, the next entrance for Volcarona means either death or survival with 1 HP, if you haven't invested your tiny 4 EV on HP.
It really seemed like you are looking for Fire - Type Sweep-ish Mons, so my suggestion will be:
- Heatran - Decent movepool, can work as staller with Magma Storm, Toxic, and Protect, force switches and set up Stealth Rock, or sweep holding Choice Scarf.
- Volcanion - Decent movepool as well, can be unexpected revenge killer with Choice Scarf, do insane damage with Choice Specs, or be a tank with Assault Vest.
- Talonflame - Although this guy is tortured bye Stealth Rock just like Volcarona, it is absolutely worth to have it on your team. This bird is so much of a problem to more than about 70% of mons in OU, especially to Keldeo, Conkeldurr, Gengar, Alakazam (without Focus Sash), Mega Pinsir, Mega Heracross, Mega Medicham, Mega Lopunny, Mega Sceptile... I can't even list how many mons have been victimized by this bird from 6th Gen. You might wanna use this bird for OU most of the time. The MUST for Talonflame are Brave Bird, Flare Blitz, and Roost. Remove Roost if you are using this bird with Choice Band, however.
Electivire:
I personally like this mon. Although it has problematically low Defense and below - average Speed as a "sweeper", it can easily gain a boost of speed by switching against Thunderus, Mega Manectric, and Zapdos. I would make it hold Expert Belt, replace thunder punch with Wild Charge, to guarantee OHKO against mons that are weak to Electric types. The reason why I prefer Expert Belt over Life Orb is that because of the fact that there are tons and tons of switches in OU, most people will know how wide Electivire's movepool is, and switch out to the mons that resist most of the moves. Life Orb will waste Electivire's health each time they switch out to a wall. It is really important in OU to preserve health due to periodic damage of Stealth Rocks between tons of switches.
I would replace Brick Break with Low Kick, since it OHKOs fully - Defense - Invested Tyranitar and does significantly large amount of damage to Rock / Steel Types that do not resist it.
Umbreon:
How about Chansey? It also has healing move, access to Seismic Toss which severely interrupt set - up sweepers, has Heal Bell / Aromatherapy, and has way more reliable bulk with eviolite.
The only drawback from using this is you will lose an access to Leftovers. (Watch out for Fighting types too, as Chansey's infamy is worldwide.)
Gliscor:
One of my favorite mons of all the time. In OU, you will have to use Gliscor as one of these three roles:
Sub - Toxic Staller
Stealth Rock Setter & Taunter
* Swords Dance / Agility & Baton Passer
Smogon says you must have 252 EV on HP and 92 EV on Speed and the rest of EV on Defense, which will allow Gliscor to outspeed Choice Scarf Magnezone and Tyranitar.
- Sub - Toxic Staller
- Protect
- Substitute
- Toxic
- Earthquake
This is a stage V cancer for mons that does not outspeed Gliscor, even if they have a move that can potentially knock out Gliscor easily. Substitute uses 1/4 HP while Poison Heal heals Gliscors 1/8 turn. This means that after Gliscor uses Substitute with 1/4 of its health, it can easily restore the same amount of HP with Poison Heal at the same turn and by using Protect next turn. So all you have to do is to use Toxic and spam Substitute and Protect until your target has low HP that is enough to be knocked out by Earthquake. Another reason why Earthquake is there is to stall out Steel types which are not often sweepers and are immune to Toxic.
- Stealth Rock Setter & Taunter
- Stealth Rock
- Taunt
- Protect / Roost
- Earthquake
As mentioned, Stealth Rock is a must in OU where tons of switches occur, and Taunt cripples Hippowdon, Forretress, Scizor that attempts to set up using Swords Dance, or against other mons that can potentially set up entry hazards. Protect and Roost is a source of heal, I would say Protect is safer way to gain a little HP with Posion Heal, especially before switching against Keldeo or Volcanion. Earthquake is a must for Gliscor to check Heatran and Excadrill.
- Swords Dance / Agility & Baton Passer
- Swords Dance / Agility
- Substitute
- Baton Pass
- Earthquake
Pretty self - explanatory. You set up with Swords Dance or Agility, make Substitute if possible, and Baton Pass it to the one who can sweep. This set, however, isn't really viable unless you count everything on sweepers.
Mega - Mons:
Try picking OU mega mon, not because they are OU, but because they have much more sophisticated stat and can be used efficiently. If you want me to give suggestions, just comment me on this.
GL and HF in the world of OU.
