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ITT half of the Pokemon are given types based on absolutely nothing
The whole idea is stupid but here are some examples of good and bad type additions.
Good:
Charizard: Fire/Flying/Dragon
Stunfisk: Electric/Ground/Water
Giratina: Dragon/Ghost/Dark
Armaldo: Bug/Rock/Water
Drapion: Poison/Dark/Bug
Arbitrarily giving Pokemon types just because:
>Sudowoodo: Rock/Grass/Fighting
>Gardevoir: Psychic/Fairy/Ghost
>Rhyperior: Ground/Rock/Steel
>Houndoom: Dark/Fire/Ghost
>Ninjask: Bug/Flying/Dark
>Metagross: Psychic/Steel/Electric