Pokémon/Pokédex/Gastly

Type Matching
Move types which are good on Gastly: Dark&sup2;, Ghost, Psychic Move types which are bad on Gastly: Fighting$${}^4$$, Grass Move types which are very bad on Gastly: Bug&sup2;, Poison Move types which don't effect Gastly:&sup3; Fighting, Normal

Ground-type moves don't affect Gastly due to Levitate.

All other move types are normal effectiveness on Gastly.

&sup3; - This immunity can be eliminated if the attacking Pokemon uses Foresight on Gastly; switching either Pokemon ends this effect (Not in Red/Blue/Yellow).

$${}^4$$ - If the immunity was removed by Foresight (Not available in Red/Blue/Yellow).

How to Evolve
Gastly evolves at level 25.

TM/HM

 * RB/Y/GS/C/RS/FL: Double Team, Psychic, Rest, Toxic
 * RB/Y/C/RS/FL: Thunderbolt
 * RB/Y/GS/C: Dream Eater, Thunder
 * GS/C/RS/FL: Attract, Frustration, Giga Drain, Hidden Power, Protect, Rain Dance, Return, Shadow Ball, Sunny Day, Thief
 * RB/Y: Bide, Explosion, Mega Drain, Mimic, Psywave, Rage, Selfdestruct, Substitute
 * GS/C: Curse, Endure, Nightmare, Psych Up, Sleep Talk, Snore, Swagger, Zap Cannon
 * RS/FL: Facade, Secret Power, Skill Swap, Sludge Bomb, Snatch, Taunt, Torment

Breeding

 * GS/C/RS/FL: Haze, Perish Song, Psywave
 * RS/FL: Astonish, Explosion, Grudge, Will-O-Wisp

Trading Cards

 * Base Set #50 - Gastly
 * Fossil #33 - Gastly
 * Gym Heroes #93 - Sabrina's Gastly
 * Gym Challenge #96 - Sabrina's Gastly
 * Gym Challenge #97 - Sabrina's Gastly
 * Neo Destiny #62 - Gastly
 * Expedition #109 - Gastly
 * Skyridge #57 - Gastly
 * EX FireRed & LeafGreen #63 - Gastly