For a limited time, if you sign up or are already registered for Pokémon Bank, you’ll receive a Passimian and an Oranguru for your Pokémon Ultra Sun, Pokémon Ultra Moon, Pokémon Sun, or Pokémon Moon game. The two Pokémon will each arrive with a Hidden Ability that they can’t acquire through normal gameplay.
Passimian is found in the wilds of Alola only in Pokémon Ultra Sunand Pokémon Sun, so this is a good way to get the Pokémon if you haven’t played these games. In battle, if Passimian is hit with a stat-lowering effect, its Hidden Ability, Defiant, will cause Passimian’s Attack to increase by two levels!
Conversely, Trainers will find Oranguru in the wild only in Pokémon Ultra Moon and Pokémon Moon. Its Hidden Ability, Symbiosis, is useful but a little tricky—in Double Battles, if Oranguru’s teammate uses its held item, Oranguru will hand its own held item over to the teammate.
To receive these Pokémon, become an active Pokémon Banksubscriber by October 31, 2019. The cost for Pokémon Bank is $4.99 for a one-year subscription. You can sign up and download Pokémon Bank via Nintendo eShop. Learn more about Pokémon Bank!
To receive Passimian and Oranguru:
- Start Pokémon Bank and select the game in which you would like to receive them.
- After receiving your gift in Pokémon Bank, start up the game you previously selected.
- Speak to the delivery person in any Pokémon Center to receive your Pokémon as a Mystery Gift.
- Remember to save your game!
Note: You will receive only one pair of Pokémon per Pokémon Bank account.
Source: Pokemon.com and @Pokemon
Pokémon Blog 
Passimian is one funky monkey.. bowling for melons! LMAO
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