Absolutely. Adopted some habits from challenge runs. Avoids using bag items in-battle, much like Corveone, as well as Set mode. Heavily favors setup strategies.
Why? Will try to break it down. Do you know how fighting Gyarados with an Electric move is really strong? Imagine having an Electric move versus an entire team of Gyarados. Hits for x4 damage when at +6 Attack or Special Attack. Takes 3 Sword Dances or Nasty Plots to do that (or 3 X-Attacks/Specials in the newer games). One-shots entire teams like this, even with iffy Pokemon. Defeated Brilliant Diamond Cynthia's team with Rampardos at an even level, for example, by setting up on Spiritomb. Used zero bag items during the fight.
Sounds great, but what about those three turns (or more) of doing no damage? How many Pokemon can survive that? Not many...without support. Fainted all six of Cynthia's Pokemon with Rampardos, as mentioned above. Brought in Vespiquen and Pachirisu to weaken Spiritomb first, however. Enabled Rampardos to use Swords Dance and Rock Polish while Spiritomb struggled to bring Rampardos below 75% health.
(Did not always go so smoothly, however. Probably fainted from a critical in at least one gym battle while setting up. Is not without its pitfalls.)
A different example: Say you are fighting Poppy in the Paldean Elite Four. Leads with Copperajah. Hits pretty hard with 130 base Attack. Sports pretty good coverage, hitting only 11 Pokemon for not very effective damage or less (including unevolved Pokemon). Identifies one weakness: three physical moves and Stealth Rocks.
Exploits that weakness. Drops its Attack to -6 with Charm/Feather Dance and paralyzes it, ideally. Inflicts 1/4 of its normal damage at -6 Attack. For comparison: An Iron Head from Copperajah at -6 versus a Ditto: 26.5 - 31.5%. A Body Slam from a +0 Attack Zigzagoon versus the same Ditto: 28.2 - 33.3%. Are you afraid of Zigzagoons? Likely not. Slap on a Leftovers to stay healthy for the Sturdy Magnezone. (Beware criticals, also.)
Accomplishes good things with other, self-sufficient combinations too.
- Garganacl: Iron Defense + Body Press. Quadruples its Defense and its Attack, in a sense, in three turns. Weathers blows easily. Used Garganacl with Recover, Salt Cure, Body Press, and Iron Defense in the first Paldea playthrough.
- Rookidee: Power Trip + Hone Claws. Gives you this power duo by level 8. Fires off a 140 power Dark move at x2.5 damage after 3 turns of Hone Claws.
- Hawlucha: Encore + Swords Dance. Do you have any idea how funny it is to lock a Pokemon into a dumb move, buff up, and then destroy everything?
Likely brings as many Pokemon with at least one status move than Pokemon with only offensive moves (if not more). Does not buff up for every fight, though. Reserves it for the major fights. Recognizes that not all fights for good for setup either. Dares not set up against a Pokemon with Toxic or Sand Attack, for example, barring some immunity.
One extra note: Used to only pack offensive moves, with the occasional Hypnosis or something. Ignored buffing moves. Blames early movesets for this mindset. Typically only handed out the weak buffing moves, like Sharpen or Growth (same for debuffing). Leaves you vulnerable to criticals for quite a while. Suffers some nasty damage when at a level disadvantage too.