I skimmed the thread and saw some discussion of a mixed Growth set, something that's not really on site. How about:
Venusaur @ Life Orb
Trait: Chlorophyll
EVs: 74 Atk / 184 SAtk / 252 Spd
Rash Nature / Naive Nature
- Growth
- Giga Drain
- Hidden Power [Ice]
- Earthquake
EVs guarantee a OHKO on SDef Heatran after SR without a boost, max Speed, rest in Special Attack. If Heatran comes in expecting either a Giga Drain or a Growth, you can actually Giga Drain it on the switch to break a potential Balloon (reducing prediction, which is nice), then OHKO with EQ. HP Ice hits mostly the same stuff as Sludge Bomb, only Grasses weaker and Dragons harder and with no poison chance. The loss of Special Attack versus the pure special Growth set can be troublesome when unboosted, but it gets a lot of the same KOs after a Growth. It's walled by Scizor, Forretress, Genesect, Skarmory, Ferrothorn, etc. of all things, but since it's on a sun team, they really shouldn't be much of a problem. Nature choice is basically outrun some really fast Scarfers and Pokemon at +2 Speed, or have more guaranteed KOs and power in general. The only thing about this is that Earthquake isn't used for much more than Heatran and maybe Jirachi, given that other Steels can handle EQ fairly well and non-Heatran Fire-types are pretty rare. It requires more team support than the pure special Growth set, but that support should be pretty intrinsic in a sun team, what with all the boosted Fire moves being thrown about. Thoughts? Is there something I'm overlooking here?