Gengar
Gengar is a dark purple, with Nightshade is signature move. First appearing in Pokémon Red and Blue, they later appeared in spin-off games, Gengar are voiced in Japanese by Kōichi Sakaguchi and in English localizations by Ted Lewis. Gengar is very mischievous, and at times, malicious. It enjoys playing practical jokes and casting curses, such as pretending to be one's shadow. Gengar who is very loyal to his trainer it still takes delight in its victim's terror. Rarely found in the wild can be found in dark caves, loves cities and back alleys. The Mega Evolution takes desirer in cursing anyone or anything in his path. 
Gengar is the most evolved of the three Ghost Pokémon in the First Generation. Also has Gengar has a Mega Evolution, available from X & Y onwards. Right now in USA Build-A-Bear have how stocked Gengar.

 

094
TypeGHOST POISON
SpeciesShadow Pokémon
Height1.5 m (4′11″)
Weight40.5 kg (89.3 lbs)
Abilities1. Cursed Body

094 (Red/Blue/Yellow)
060 (Gold/Silver/Crystal)
094 (FireRed/LeafGreen)
071 (Diamond/Pearl)
071 (Platinum)
060 (HeartGold/SoulSilver)
032 (X/Y — Mountain Kalos)
063 (Sun/Moon — Alola dex)
075 (U.Sun/U.Moon — Alola dex)
094 (Let's Go Pikachu/Let's Go Eevee)
143 (Sword/Shield)

3 Special Attack
Catch rate45 (5.9% with PokéBall, full HP)
Base Friendship50 (normal)
Base Exp.225
Growth RateMedium Slow

Breeding

Egg GroupsAmorphous
Gender50% male, 50% female
Egg cycles20 (4,884–5,140 steps)