Evolving Greavard into Houndstone in Pokémon Scarlet and Violet requires you to use a special method.
To help you get this best boy Ghost-type for your Gen 9 Pokédex, we've detailed what this method is and exactly how to evolve Greavard into Houndstone below, as well as where to find Greavard first to start the whole process.
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Where to find Greavard in Pokémon Scarlet and Violet
There is a small patch elsewhere that Greavard spawns, but generally speaking, you can find Greavard on Glaseado Mountain.
Look out for movements below the snow, as Greavard likes to Dig to move about - but you can still see its blue candle above the ground.
Greavard is quite weak, however, so you'll probably want to evolve Greavard into Houndstone to use as an effective Ghost-type in your party.
Our Pokémon Scarlet and Violet walkthrough can take you through the entire game - including The First Day of School, Victory Road, Starfall Street, Path of Legends and when you're ready, The Way Home and the final boss. Elsewhere, we can help with the Normal Gym test Secret Item menu, version differences, the best Scarlet and Violet starter, EXP farming, shiny Pokémon and learning how to fly, swim, climb and dash. When it comes to individual Pokémon, we can help with Gimmighoul, Ditto, Bellibolt, Pawmot, Scovillain, Frigibax, Sinistea, Brambleghast, Annihilape, Farigiraf, Dudunsparce, Lycanrock forms, Armarouge and Ceruledge.
How to evolve Greavard into Houndstone in Pokémon Scarlet and Violet
To evolve Greavard into Houndstone in Pokémon Scarlet and Violet, you need to level Greavard up at night after it reaches Level 30.
To be safe, make Greavard your lead Pokémon and get the EXP you need to gain a level by battling, not by using items like Rare Candy. You can, however, use Auto Battle or EXP Candy to quickly get Greavard's EXP bar high enough, then take part in a battle to actually evolve it into Houndstone.
It's also worth noting that it seems Greavard won't evolve into Houndstone at dusk or dawn - it has to be when the sky is fully dark. We tried evolving it right on the cusp, at dawn, but it didn't work.
You can also find a Houndstone in the wild instead of evolving Greavard, but it's a rarer sight, so you might need to eat a meal with increased encounter power for Ghost-types to find it. Just like Greavard, Houndstone uses Dig to travel under the ground, but its tombstone appears above the ground, letting you track its movements.
Here's where you can find Houndstone in Pokémon Scarlet and Violet: