Gastly should have Hypnosis learnt already at the point of catching it.
Level 8
Ghastly will evolve at level 20.
Ghastly evolves at a level 25.
In the third generation Pokemon games, Haunter learns Mean Look at level 13. Because it doesn't evolve into Haunter from Ghastly until level 25, it is recommended for the player to catch or raise a Ghastly that knows Mean Look at level 13 before evolving it into a Haunter.
ghastly can use the move dream eater for more info go to serabi.net
Ghastly evolves into Haunter at level 25, and Haunter evolves into Gengar when traded.
yes according to the show
In Pokémon Gold, Ghastly learns the move Dream Eater at level 43. Dream Eater is a Psychic-type move that allows the user to heal itself by damaging a sleeping opponent. However, since Ghastly is a Ghost/Poison-type Pokémon, it must first put its target to sleep using a move like Hypnosis to effectively use Dream Eater.
Haunter at level 25
Level 25 into Haunter, then trade to make it Gengar
Ghastly is the name of a Pokémon that is Poison-type and Ghost-type at the same time. It has two evolutions known to date. The first one is Haunter, in which Ghastly becomes once it reaches level 25. Once as Haunter, it can be evolved to Gengar through Trade with another trainer.
There is no 100 lv. gastly.If there was it would have evolved by now.