* Which game are you playing? The availability of Psybeam varies between Pokémon games.
* What Pokémon are you trying to teach it to? Some Pokémon learn Psybeam through leveling up, while others need to learn it through a TM or TR.
Here's how to find Psybeam in most Pokémon games:
1. Leveling up: Some Psychic-type Pokémon learn Psybeam naturally as they level up. Check the move list for your specific Pokémon to see if it learns Psybeam this way.
2. TMs/TRs: Psybeam is often available as a Technical Machine (TM) or Technical Record (TR). These can be found in various locations within the game, such as shops, trainers, or hidden areas.
3. Move tutors: Some games feature move tutors who can teach specific moves to certain Pokémon. Check if a move tutor in your game offers Psybeam.
To get a more specific answer, please tell me which Pokémon game you are playing and what Pokémon you are trying to teach Psybeam to.