Pokémon Black/White:
* Route 17: This is the most common place to find Deino, but it's still a rare encounter.
* Undella Bay: Deino can also be found in this area, but again, it's rare.
Pokémon Black 2/White 2:
* Route 17: Deino can still be found here.
* Undella Bay: Deino can still be found here.
* Victory Road: A more reliable encounter than the previous locations, but still rare.
Pokémon X/Y, Omega Ruby/Alpha Sapphire:
* Pokémon Bank: Deino can be transferred from older games using Pokémon Bank.
* Friend Safari: Deino can appear in the Friend Safari of some friends who have it in their Pokédex, though it's not guaranteed.
Pokémon Sun/Moon, Ultra Sun/Ultra Moon:
* Pokémon Bank: Deino can be transferred from older games using Pokémon Bank.
Pokémon Sword/Shield:
* Pokémon Bank: Deino can be transferred from older games using Pokémon Bank.
* Max Raid Battles: Deino has been found in Max Raid Battles, though it's not guaranteed.
Pokémon Brilliant Diamond/Shining Pearl:
* Pokémon Bank: Deino can be transferred from older games using Pokémon Bank.
* Grand Underground: Deino can be found in the Grand Underground, but only in specific areas and with specific conditions.
Pokémon Legends: Arceus:
* Deino is not available in Pokémon Legends: Arceus.
Other considerations:
* Deino has a low encounter rate, so you may need to spend some time searching to find one.
* Deino is a Dark/Dragon-type Pokémon, so be sure to check the locations that are known for those types.
* You may need to use a Poké Radar or other tools to increase your chances of finding Deino.
Note: This information is based on the most common locations and methods for finding Deino. Availability and specific encounter rates can change based on game updates and other factors.