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If we're talking about pokémon as pets, ie keep them in our houses, I think It's hard to choose when we have to take in account the pokémon's needs. For example, I'd like to have a Vaporeon, but I think that in real world it should need a constant font of water to keep it's skin moist, like frogs or dolphins when they are removed from water for some reason. So I'd need to have a pool or something like, what I don't have, so my Vaporeon would be in danger.
I think I should choose a pokémon without this kind of special needs. And something small, preferably.
I really like the Nidorans. Though maybe they could be dangerous with that poison spikes, so...
A Pidgey or HootHoot would be awesome too. They're small, inoffensive and I could raise them easily.