Technically, Gastly had Hypnosis at level 1 and by the time you catch it the move has been overwritten by moves Gastly learns at higher levels . So, you need to obtain a Heart Scale in the underground and take it to someone in Pastoria City, who will then be able to teach Haunter Hypnosis.
the only way haunter can learn hypnosis is to have two in daycare and it breed gastly the lvl1 gastly should know hypnosis hope i helped :)
Haunter should know Hypnosis at the point of catching
Haunter should know Hypnosis already when it's caught.
If you caught it as Haunter it will start with it. Same as Gastly
Haunter does not learn Hypnosis. Gastly starts with Hypnosis at level one.
lv.24
It Learn Hypnosis At Level 16 Must Catch Level 16
Do you mean "Haunter"? Haunter should already know Hypnosis. If it doesn't, use a Heart Scale. This is not a wise comment, this is the answer.
level 45 in fire red leaf green
At level 200
haunter learns it at level 34
Gastly > lvl 25 > Haunter > trade evolution > Gengar
Slowpoke doesn't learn hypnosis
Wobbuffet cannot learn Hypnosis.
In Pokémon FireRed, Gastly evolves into Haunter at Level 25.
There is no TM for Hypnosis in any of the versions of the game. Unfortunately, the only way to learn hypnosis is through breeding or your Pokemon leveling up. Level up haunter and it might get hypnosis.
No, Kadabra does not learn Hypnosis in Pokemon Ruby, Sapphire, Emerald, FireRed, LeafGreen or Diamond and Pearl at any level.
Snorlax does not learn hypnosis.