The philosophy of random battles is that Pokémon should be able to perform at their best fulfilling authentic roles that they can usually fulfil. As a result, item diversity isn't a primary concern. It just so happens that in random doubles, Sitrus Berry tends to be the best item for most Pokémon to use, and that's certainly seen in Smogon Doubles, the format that random doubles is based on.
- Expert Belt is always outclassed by Life Orb in doubles. Doubles is a hyper-offense format by design -- it's why it's used in official tournaments like VGC because games don't take very long -- so the 10% recoil damage from Life Orb is always a good trade for more power behind all of your moves than even a SE hit with Expert Belt.
First off, THANK YOU so much for this
extremely insightful and comprehensive response. I don't know how well sincerity comes across on the internet, but I am completely dead serious on this; thank you.
Expert Belt has a huge benefit that Life Orb doesn't; it can be used to bluff having a different item. When you get one-shot by a Life Orb-boosted attack, you know what the item is immediately. When it's boosted by Expert Belt? Not at all. Could be berry, could be AV, could be scarf/band/specs, could be anything.
- Wide Lens does have very niche circumstances where it's better than any other item, but I don't think any Pokémon in the format currently reside in those niche circumstances. What do you think it should be used on?
Rotom forms (though not fan or base) with their specialty attack, Will'O'Wisp, electrowebs and Thunder could exploit it. Tsareena with Triple Axel and High Jump Kick, or frankly almost anything with Triple Axel (where wide lens turns it from ~70% to ~97%) like Weavile or Froslass. Venusaur has often used it in VGC as well for Sleep Powder and Leaf Storm. If you really want to get crazy, Hustle pokes could use it, too, but I think that's a reach!
- Lum Berry suffers from the relative scarcity of status in doubles. It would do nothing more often than not, and items are very important in doubles so that's a huge opportunity cost. Life Orb and Sitrus are far more consistent than Lum, so they're used more.
- Leftovers / Black Sludge are very bad in doubles. Pokémon are rarely alive for long enough to recover more HP than they do via Sitrus due to its offensive nature.
This is definitely too broad. There are a fair few pokemon that love leftovers in doubles. Lugia is a big one (most other pokes that rely on having full health are too offensive, like Lunala or Dragonite), but other pokemon that love sitting on the field for a long time as well (Ferrothorn, calm mind Kyogre, calm mind Tapu Fini, Turtonator, Bronzong, etc.) can really make good use of it. Yes, Sitrus is better for
most pokemon, but not for all of them.
- Weakness Policy is used on a few mons where it's appropriate, what else do you think needs it and it will be considered?
Those Multiscale users would be a big one--Lugia absolutely should have policy a fair percentage of the time, as should most other bulky Ubers. Dragonite and Lunala and N-DW and Filter pokes have the ability to survive a super-effective attack and to strike back at doubled strength.
Set diversity is something that is valued in random battles, but many Pokémon only have one viable set and making Pokémon worse sometimes just for set diversity isn't something that makes sense to do. Ninjask with Dual Wingbeat and an item is always worse than itemless with Acrobatics. Rotom Tricking Scarf onto something in doubles would rarely be as useful as being able to choose different moves, and the speed boost from Blunder Policy is higher than Scarf's speed boost anyway. Flareon already doesn't need to Protect whenever it's on the field, in fact it's usually better to use Flame Charge on its first turn out if it has it.
Fair enough! I don't think it's as cut and dried as you say it is; I think that having so few sets for some pokes makes them eminently predictable. For instance, even the threat of sash on a Ninjask with Swords Dance and Baton Pass would change the way people play around it. The fact that Arctovish is always the same old blunder policy blizzard + bolt beak set makes playing around it way easier than it would be if scarf sets existed for it. (BTW, maybe these sets
do exist and I haven't seen them yet! My apologies if so.) Calm Mind Lefties Kyogre, specs Kyogre, scarf Groudon, offensive Grimmsnarl, specs/scarf Spectrier, WP Glastrier, Trick Room + Curse Mimikyu, Ally Switch Rapidash, power herb meteor beam Omastar/Archeops/Lunala/Eternatus, etc. are perhaps not strictly the best sets but can take huge advantage of the element of surprise.
NFEs are considered when they aren't just a lite version of their evolution. Tangela, Electabuzz, Magmar, and Rhydon would all fill the same role as their evolution, so there's no reason for them to be included. Singles in particular has lots of NFEs, but there aren't any that are seen as worth adding in doubles right now. I did also suggest Sneasel off the back of your post, but it was determined that that isn't worthwhile either.
Ehh, Electabuzz is a special attacker while Electavire is physical, Magmar can be mixed while Magmortar is almost always special, and Sneasel has Inner Focus which is a huge niche. There are others, too - I totally forgot Torracat, which is very very distinct from Incineroar.
Levels in random doubles are actually determined and modified frequently by their winrates. Pokémon are at the appropriate level for their average performance, and that system won't be changed.
That is awesome! Is there a public database anywhere of that data? I'd be insanely curious to look through! Again, thank you so much for the information.
You have yourself an awesome day. Thanks again.