All 6 could be 'NORMAL' but there can only be one of each species.
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But what about the 3 water pokemon?????
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There is nothing wrong with that. They are all different. Hell you could even put in a Chansey and a Blissey in the gym at the same time. It just cant be 2 of the same pokemon like 2 blisseys or 2 snorlax.
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Oh okay. Got it.
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Lol whut? Since when is Blissey and Snorlax the same Pokemon? XD
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hahahaha easy man, maybe he is a child and don't undertand that type =/= species.