Alright I want to talk about Heatran. I think we need to compare this thing to the mons in A and A+ before we get into rising this mon. I see Heatran on the level of things like Garchomp. It has very nice positives but some hindering flaws. Heatran has no reliable recovery. If this thing is the so called blanket check it is then its not gonna check all that shit without being at 30% 2 turns into the match. Its hard to be a wall and have no reliable recovery. Second point, its way too overvalued on how much offensive presence it has. If you're making this a blanket check its not having any offensive presence outside of lava plume and toxic. I've also heard people call this thing fast. Get real. Your average Lando-T tank build is out speeding Heatran with a faster tank build. The point I'm trying to make is that when you compare Heatran to mons in A+ it does not have the same advantages they do. Like I said its more on the level of stuff like Azumarill, Excadrill, and Garchomp. Good strengths but noticeable flaws that can be hard to patch up with a team. I can't see it being in the same rank as mons like Lando-T, Tyranitar and Keldeo.
Since when has Heatran only been useful as wall or a pokemon with an amazing offensive presence? Nobody is saying that, what
Hailfall said was that it was a very versatile pokemon with many sets that it used effectively. Heatran is way more splashable than any of the other A pokemon (baring garchomp, which is slightly more splashable and a pokemon that many others have already said should rise). It has an amazing typing, meaning it can fit onto many Steel/Fairy/Dragon and Fire/Water/Grass cores. On top of that it also has many sets all of which it uses very effectively. Yeah sure the Utility Heatran does not have a reliable recovery but that doesn't mean jack shit when Heatran most likely x4 resists the hit that its switching in on. Also pokemon like Rotom-W don't have reliable recoveries and although rotom-w and defensive heatran are two completely different pokemon, basing your entire argument against this set for its lack of recovery, yet not explaining why the lack of recovery is so bad for Heatran and not these pokemon is stupid af. Especially considering you said
Its hard to be a wall and have no reliable recovery
.
By that argument Landorus-T would also be in A, however Landorus-T is not in A and won't be anytime soon because a lack of recovery doesn't make a wall instantly fall apart by turn 2. Don't get me wrong a lack of recovery is bad for a pokemon, but I feel you exaggerated the shit out of its lack of recovery and focused in on its main flaw without even acknowledging all it has to make up for it. By the way, comparing Garchomp to Heatran is misleading as hell considering the main reason why people hold back Garchomp from A+ is because of Landorus-T, while on the other hand Heatran faces almost no competition for what it does.
The second thing I would like to talk about is the offensive set. Bulky offense is incredibly common and it definitely one of the best playstyles in ORAS OU, and offensive tran fits this playstyle perfectly. Surprisingly just because people brand this as an offensive set, it still can blanket check much of the tier. It will still take hits from pokemon like Clefable, and Serperior just fine. It might not avoid the 2hko from things like Gengar's shadow ball or +2 mega zor knock off but it still will blanket check so many pokemon without its bulk just because of its amazing typing. As a result of this, Heatran does not need a good speed stat as much as you think. It's defenses combined with its SpA stat and stellar movepool (magma storm, lava plume, taunt, earth power, ancient power, flash cannon, stealth rock, etc) allows it to switch in on its resists and hit them hard back potentially even trapping them and killing them with toxic. Even the ability of Heatran is amazing, just having this thing in the back of your party is seriously going make your opponent question every fire move they make. Honestly, I do not know why Heatran is not in A+, the pokemon is exceptionally splashable, has an amazing typing, a great movepool, great defenses, faces little competition, requires little team support, and so much more.
Heatran should rise to A+.