I'm looking for a database (in whatever format) that contains all official Pokémon data (~PokéDex). A good example is the data serebii.net has, but the owner of the site doesn't seem to be eager to hand his data over.
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This Python project on GitHub contains a lot of up-to-date Pokémon information (including evolutions and moves etc) from the video games, which may be useful to you in some way.
Can't vouch for its completeness, but http://www.pokemon.com/us/pokemon-trading-card-game/database/ seems to be a similar resource to the Magic TCG's "Gatherer".
Certainly when I made a request for cards with the name "Pikachu" I got 27 card results, so it seems like it could keep a deckbuilder busy for quite a while...