Answer 1

Not much, really.

^ Normal

^ Shiny

Shiny's grey(er?). Of course shiny Gengar would sparkle when entering battle.

Gengar - Pokedex - this is the kind of stuff you can check on the Pokedex on this site. All entries have the Pokemon's normal sprite and shiny sprite.

Answer 2

This is the normal one

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This is the shiny

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As you see the shiny is darker and less Colorful. The normal Gengar is more purple.

Comments

oh, ok.Thanks gyus

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i got only 1 Upvote because of i was 30 sec late :(

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Nope. Two.I voted (up) your answer