As part of the “Mythic Blade” event, Pokemon Go adds Keldeo to the game, although it can only be obtained by purchasing a paid ticket which unlocks the “something extraordinary” Special research tasks.
To get the “Something Extraordinary” (and Keldeo) Special Research Task Set, you will need to purchase the $7.99 ticket in store. Furthermore, you will have to actually open the game and accept the search some time in between December 10 at 10 a.m. and December 11 at 8 p.m. in your local time. If you don’t, you won’t get the search.
Once you start the Special Research, it will be permanently unlocked, so you won’t be in a rush to complete it.
Keldeo will likely be available through some type of free play method at some point, but it’s unclear when. Seeing how free players haven’t had a chance to get Shaymin yet (which was from a paid event in June and August), you’ll have to wait a while to get Keldeo.
Below we list the steps of the special research task for “Something Extraordinary” to unlock Keldeo, thanks to the help of Serebii.net.
Something extraordinary step 1 of 7
- Make 3 curveball throws (500 Stardust)
- Catch 10 Pokemon (Oshawott encounter)
- Take a snapshot of a wild Pokemon (10 Great Balls)
Awards: 2 Rare Candies, Machoke encounter, 2 Silver Pinap Berries
Something extraordinary step 2 of 7
- Defeat a team leader 3 times (750 Stardust)
- Catch 5 different species of Pokemon (Staryu encounter)
- Power up Pokémon 5 times (1 Charged TM)
Awards: 2 Rare Candies, Breloom encounter, 2 Silver Pinap Berries
Something extraordinary step 3 of 7
- Battle in a Raid (1000 Stardust)
- Catch 5 Fighting-type Pokemon (Buizel encounter)
- Evolve 5 Pokemon (3 Egg Incubators)
Awards: 2 Rare Candies, Scraggy encounter, 2 Silver Pinap Berries
Something extraordinary step 4 of 7
- Fight 5 times in the Go Battle League (1,250 Stardust)
- Catch 7 different species of Pokémon (encounter with Marill)
- Use 5 Berries to help catch Pokémon (2 Incense)
Awards: 2 Rare Candies, Poliwrath encounter, 2 Silver Pinap Berries
Something extraordinary step 5 of 7
- Win a Raid (1,500 Stardust)
- Earn 5 hearts with your buddy (Alomomola encounter)
- Feed your buddy 3 times (1 Fast TM)
Awards: 2 Rare Candies, Keldeo encounter, 2 Silver Pinap Berries
Something extraordinary step 6 of 7
- Win in the Go Battle League (1500 Stardust)
- Catch 15 Fighting-type Pokemon (Tympole encounter)
- Perform 3 great throws in a row (2 Super Incubators)
Awards: 2 Rare Candies, Medicham encounter, 2 Silver Pinap Berries
Something extraordinary step 7 of 7
- Take 3 snapshots of Keldeo (Tirtouga encounter)
- Take a snapshot of a Grass-type Pokemon (2,000 Stardust)
- Take a snapshot of a Steel-type Pokémon (2,000 Stardust)
- Take a snapshot of a rock-type Pokemon (2,000 Stardust)
Awards: 2 rare candies, 20 Keldeo candies, Keldeo t-shirt