It's possible you are thinking of:
* Darumaka: A Fire-type Pokémon that evolves into Darmanitan. Darmanitan has a Zen Mode ability, but it's not something you "get." Darmanitan automatically switches to Zen Mode when its HP falls below half.
* Darmanitan: The evolved form of Darumaka. It doesn't learn any moves that trigger Zen Mode, it's an ability that activates automatically based on its health.
To get Zen Mode:
1. Obtain Darumaka: You can find Darumaka in the following locations:
* Route 1: During the day
* Route 10: During the day
* Route 16: During the day
* Route 17: During the day
2. Evolve Darumaka: To evolve Darumaka into Darmanitan, you need to level it up to level 35.
3. Zen Mode: Darmanitan automatically activates Zen Mode when its HP falls below half. This changes its appearance, stat distribution, and type to Fire/Psychic.
If you're still unsure about what you're looking for, please clarify your question by providing more details about the Pokémon or ability you're interested in.