So, I started with Latios. I planned on running the typical Latios set, with draco/psyshock/tailwind/tect. But as I started building this team, I thought, "wow, Mega Zard Y bends me over and annihilates me." I know heatran is fire immune, but many Zards are running focus miss or HP ground to counter tran. So I innovated a little here, replacing tailwind with HP rock to snag those pesky sun dragons. An actually serious drawback of HP rock means you will never win speed ties with other base 110s with boosting natures: mega diancie, megagross, etc. So that kind of sucks.
Mons in tiers 1 and 1.5 that this mon is good/not bad against (referred to as #1 from now on):
Amoonguss, Mega Charizard Y, Keldeo, Kyube (depends on matchup), Other Latios (Depends on matchup), Talonflame, Terrakion, Thundurus
Mons in tiers 1 and 1.5 that this mon is bad/not good against (referred to as #2 from now on):
Megagross, Kyube and Latios (Depends on matchups), Jirachi, Hydreigon, Bisharp, Lando T, Mega Kang, Mega Diancie, Aegislash
Any mons not on these lists I consider neutral.
With Heatran, I sort of innovated but not really, as this is a set that's been seen around for a while. I always have at least one mon with taunt on the team, and that role ended up falling on heatran. Also, its EV'd to creep lando t under twind, with max spa and rest in hp.
#1: Aegislash, Amoonguss, Mega Kang, Bisharp, Jirachi, Megagross
#2: Terrakion, Kyube, Skymin, Rotom-W, Lando-T, Keldeo, Mega Diancie, Mega Zard Y
I decided next to add a bulky water because Boy Do I Love Speed Control™. Cune is amazing in my opinion, sick bulk and a nice move pool. Here I even go balls out and drop protect for Ice Beam, because Fuck Landorus™. The spread is the smogdex spread but with 20 HP EVs put into speed to creep "guess who" under t wind.
#1: Mega Diancie, Lando T, Heatran, Hydreigon, Latios, Talonflame, Terrakion
#2: Thundurus, Megagross (Hope scald burns), Kyube, Skymin, Rotom-W, Keldeo, Amoonguss (He sleeps you)
Breloom is eh but I wanted more offense at this point while also using a disruptive mon and breloom fits that nicely. Just running the standard set here, but I'm adamant because mach punch is priority and most waters are pretty slow.
#1: Mega Diancie, Mega Kang, Keldeo, Rotom-W, Bisharp, Hydreigon, Terrakion
#2: Talonflame, Megagross, Latios, Kyube, Skymin, Lando-T, Cress, Mega Zard Y
Boy Do I Love Speed Control™. Fuck Amoonguss™. This set also creeps lando T lol. Follow me is pretty nice, even though nothing needs it to set up, it can allow me to play with my opponent and over all control the game better.
#1: Amoonguss, Keldeo, Skymin, Hydreigon
#2: Thundurus, Terrakion, Megagross, Kyube, Jirachi, Bisharp, Rotom-W, Lando-T, Mega Diancie, Aegislash
Please believe me when I say mega scizor isn't shit tier. It hits like a truck and not a lot stands in its way after you take down heatran and zard. This is max attack with enough speed to creep skymin under t wind and the rest in hp. It isn't the best of mega's but it hits hard as nuts and helps me deal with cress.
#1: Amoonguss, Cress, Mega Diancie, Mega Kang, Keldeo, Skymin, Hydreigon, Kyube, Latios, Terrakion
#2: Talonflame, Heatran, Rotom-W (burns you), Mega Zard Y