In Pokémon Blue, you can catch Hypno in the Unknown Dungeon which can only be gained access to after beating the Champion however you would have the option of catching Drowzee in Route 11 and then evolving it into Hypno as soon as it hits Level 26.
Catch a drowzee in a swarm and evolve it
Hypno doesn't evolve.
in blue rescue team you are a pokemon, so you cant catch pokemon, you are friends with them.
You'll need to evolve Drowzee to get Hypno.
Gastly has hypnosis as soon as you catch it also drowzee, hypno and many other ghost type Pokemon and psychic type Pokemon.
Hypno
Hypno's Naptime
Hypno is #97 in the national pokedex, and it is a Psychic type Pokemon.
Hypno
Seriously? You can't catch trainers.
Try to catch it with a masterball. that's what i did.
You cannot catch one. You can only choose it as a starter Pokemon in Pokemon Red and Blue.