Lately, I've been casually laddering OU to figure out the ever important question of what types are the best to brainlessly spam on the OU ladder. You all already know that DarkSpam and FairySpam are the two best spam types in the game as proven time and time again in tournament and in ladder so I don't need to comment on those, but I figured it would be fun to see if there are any other types that are lowkey underrated when it comes to spamming them on Bulky Offense/HO. Might eventually create a personal tierlist for the heck of it, but I figured I'd share with y'all the results I've had so far.
RockSpam:
If I were to describe RockSpam in two words, it would be HOLY ASS. Despite hitting 5 types super effective with your coverage, having decent to great targets to smack up in the tier like Kyurem and the birds, and usually having great coverage to complement rock type, you'd be surprised at how bad this type is (at least in my experience). I think the crux of the issue is that rock types genuinely have 0 defensive utility in the tier, and so many mons just poke a shit ton of holes into your team that it's insane. In particular, I found Well-Spring to be a huge pain in the ass cuz it does such a good job at breaking through the defensive holes that stacking two rock types creates. Also doesn't help that you only have two mons on Rock that have 100% accurate stab. Cornerstone is definitely the bright spot of this type comp since its fast but also actually hits hard, and I had the most success pairing it with Band Tar to occasionally pull off a sweep. Still, I don't think the upside of Rock's offenses are enough to compensate for the sheer ass the best mons on the type are at being defensively sound.
Iron Boulder, on the other hand, is complete ass. Holy fuck, I do not get how this thing is still ranked B- on the VR. Hits like a complete wet noodle, it never 2HKOs any of the mons you need it to, gets OHKOed by a light breeze, and its amazing speed tier is legitimately wasted on it. Genuinely might be the worst mon I've ever had the displeasure of playing with since unlike most shitmons, you actually expect Iron Boulder to do something. Avalugg-Hisui was also something I fucked around with for a bit. Stole the lead Avalugg tech from an aim video, and its lowkey pretty funny to use in the leadslot. I wouldn't call it good by any stretch of the imagination, but plenty of ladder kids underestimate how much damage output loaded dice Avalugg can shit out.
Rating: D Tier --> Ass
BirdSpam:
BirdSpam is a certified Smogon classic, so you know I had to try it next. That being said, despite its historic bustedness, BirdSpam is weird af in Gen 9. You got a bunch of really good mons with the flying type, but practically none of them are capable of using their Flying Type offensively. Lando and Dnite don't got reliable flying stab. Hurricane is not a real move so none of the Gen 1 Legendary Birds, Iron Jugulis etc are helpful. A lot of the really cracked Flying Attackers have to waste tera to be able to use Flying Type which puts it in this weird and inflexible spot when it comes to teambuilding. Despite that, you do have some standouts. Zapdos-G got some goated coverage and hits hard with the band but its 100 speed tier is painfully slow this gen (losing to Wellspring is not a good look). You could theoretically justify running Dual Wingbeat on Gliscor but I don't know if I would bother. Salamence and Dragonite can put in some work as Ddance sweepers, but Roaring Moon might unironically be BirdSpam's strongest warrior this gen with Booster Acro, so I just ended up using Zapdos-G and Roaring Goon as the bird-spam template.
I genuinely can't tell if this type is a bad spam type or not because of how awkward it was to build with, but it did decently enough in my experience. That being said, I think the strength's of flying plus the busted nature of Roaring Goon at least makes this a pretty damn decent type in hands of an actually skilled player, so I'd say that you should try this one out if you want to try your hand at an unorthodox team comp.
Rating: B Tier --> Might be good but I'm not good enough for it :(
BugSpam:
On paper, you might say that BugSpam is the worst offensive spam type in the game considering the only worthwhile type you hit SO is Dark, and that's what I thought would happen initially too. In practice, I actually think BugSpam is a lot better than you might think. Scizor and Lokix are the only two mons I'd bother with for this playstyle, but they actually do a decent job at pressuring their common checks with Knock and U-Turn. More importantly though, Scizor has actual use defensively even if you're rocking the classic CB BulletPunch. Lando + Samu + Iron Crown is one of the most solid cores out there, and in my experience, Scizor can reasonably fit into the Iron Crown slot provided you slot in a fairy type to take care of the stuff Scizor can't cover that Crown can. I used Haterene to do that, and I honestly might start using that 4 mon core more since it was so solid. Haterene + Taunt Lando is just amazing at aggressively keeping hazards off without the need for a Rapid Spinner, and Lokix and Scizor put in the work through U-Turn cycling down the team and fucking up their offensive mons with priority. Special shout out to all the midladder stall teams I faced cuz Scizor + Lokix Knock + U-Turn directly into Haterene was basically a guaranteed 6-0.
Haven't tried out every type to form an opinion, but I genuinely think BugSpam is better than RockSpam on account of Scizor being the giga-goat and Lokix its greatest disciple. That being said, I'll tentatively slot it into C Tier for now.
BugSpam: C-Tier (but better than I expected!)