What it does
Yawn is a Normal-type status move that marks the target for Sleep at the end of the following turn. Accuracy checks are bypassed entirely — evasion boosts and sand don't interfere. The target falls asleep unless it switches out before the sleep triggers, or already has a status condition (in which case Yawn fails on use), or has Insomnia or Vital Spirit (sleep is blocked but Yawn still fires without failing).
The switch-out escape clause is the defining mechanic. In doubles, the cost of switching is lower than in singles — the other Pokémon keeps acting, so the marked one can exit without fully losing a turn. That means Yawn rarely forces actual sleep in doubles. What it does is force a choice: stay in and fall asleep, or leave and let you gain information and momentum from the forced switch. Both outcomes favor you.
In singles, the forced-switch value is higher because switching has a bigger tempo cost, and the opponent has fewer immediate options.
Who runs it
Umbreon at 53% uses Yawn as a cornerstone support move. Its high HP and Special Defense let it take hits before firing — and being Dark-type makes it immune to Psychic reprisals from opponents trying to stop it.
Vaporeon at 51% pairs Yawn with Wish and Protect in a stall loop: Yawn the threat, Protect for the sleep trigger, Wish for recovery. The opponent either switches or goes to sleep while Vaporeon heals up.
Snorlax at 31% is slow but that's fine — Yawn doesn't need priority. Its bulk means it survives to use it consistently.
Blastoise at 30% uses it in harassment sets, dragging opponents between switching and sleeping while staying healthy itself.
Slowbro at 13% specifically thrives in Trick Room — the low Speed becomes an asset and Yawn disrupts opposing setups.
How to use it
After using Yawn, the classic follow-up is Protect. Your Pokémon is safe for a turn; the opponent must choose between staying in (and sleeping) or switching (and giving up position). Either way you've forced a suboptimal decision.
Don't use Yawn on a target that already has a status condition — it fails on use, wasting the action entirely.
In doubles, pair Yawn with a partner that punishes switching. If the opponent swaps the sleeping Pokémon for something else, that something else should immediately face a threat. That pressure turns 'forced switch' into a real advantage, not just a neutral outcome.
Tips & strategy
Insomnia and Vital Spirit block sleep — look for these before clicking Yawn into a matchup where they're likely. The Yawn doesn't fail, but you gain nothing useful.
The psychological pressure of Yawn is real. Opponents tend to react to it immediately, often switching before they'd otherwise plan to. That disruption of their prepared turn sequence is sometimes worth more than the sleep itself.