Gastly's moves on Pokemon FireRed and LeafGreen:
Lvl Name
1 Lick
1 Hypnosis
8 Spite
13 Curse
16 Night Shade
21 Confuse Ray
28 Dream Eater
33 Destiny Bond
36 Shadow Ball
41 Nightmare
48 Mean Look
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Ghastly will evolve at level 20.
In Pokémon LeafGreen, Geodude will learn Magnitude at Level 16.
Ivysaur will learn sweet scent at level 29 in Pokemon fire red and left green.
Zapdos will learn Thunder on it's on sometime around level 60.
Ghastly evolves into Haunter at level 25, and Haunter evolves into Gengar when traded.