This seems to be a very interesting tier idea and I'm willing to try this tier. Before I start to create a team, I take some notes to this tier based on pure theorymoaning.
- no instant weather changer
Tyranitar, the Hippo and Snowobama line, Groudon and Kyogre can't learn Explosion / Selfdestruct, therefore there is now instant weather in this tier.
-> Offensive weather (rain, sun) seems to be VERY viable. In fact you have Electrode, Azelf and Mewtwo (seriously) to change weather (+ Bronzong for rain).
Unluckily the options for
rain seem to be poor. The only Pokémon with Swift Swim is Qwilfish and the other decent rain abusers seems to be Scarf Wailord and Wailmer. I'm not joking, the latter one should be still useful, as the tier lacks good water resists. The only one who are FE are Eggs, Cloyster, Qwilfish and Wailord, heck, even Scarf Cloyster can easily sweep under rain in this tier.
The options for
sun are even better. You have Exeggutor and Shiftry as Chlorophyll abusers and Scarf Heatran as the main sweeper. The list of Pokémon who can switch into sunny day teams easily are unluckily longer, Scarf Heatran gives free switches for Heatran unluckily, who can also abuse the sun and put you into big trouble. Anyway, seems to be quite viable.
- Lickylicky has the strongest boom in the tier, followed by Snorlax w/ Selfdestruct
- Regirock takes the least damage from Explosion, followed by Steelix. Both can survive CB Lickylicky's Explosion and CB Snorlax's Selfdestruct with little investments.
- The Ghastly line and the Drifblim line are the only ghosts in the tier, therefore they are the only ones immune to Explosion in the tier.
- Skuntank is the best Pursuiter in the tier and can easily remove the ghosts. Unluckily his Explosion is rather weak and he lacks the ability to seriously hurt the countless steel- and rock types in the tier.
My favorite Trick Room core in standard (Bronzong, Heatran, Exeggutor) are able to learn Explosion. I can assure you that the trio is indeed offering next to perfect coverage, both offensively as well defensively. Furthermore there are tons of other slow TR sweepers in the tier.
- Fast subs + Protect can protect from mindless spammed booms. Endure is another option that can work well with Custap Berry (no SS in this tier) for massive lulz.
- SR is a must-have for breaking focus sashes. At least I'd be sick when my opponent would survive my Explosions all the time, just because I didn't break their sashes. Remember, no SS in this tier.
Mewtwo is allowed in this tier? Ugh, seems to be quite gamebreaking. At least I have to try a SubLO-set with Shadow Ball / Aura Sphere / Selfdestruct. Looks very nice on paper.
... I guess it's time for testing. Themed teams (TR, sun, rain) seem to be working very well and I guess that's the first thing I'm going to test. Better than theorymoaning for sure...
PS: Smeargle (and all NFE Pokémon that can learn Explosion / Selfdestruct bar Magneton are lacking, but I guess that's not important.)
Also, Soul Dew clause is unnecessary for this tier, technicially.
EDIT: Oh, Smeargle was added in the list in the OP. Always too slow...