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I take it by your distinguishing between "best" and "favorite" that "best" is to mean "most effective in PVP". Honestly, even with the introduction of Fairy type and other nerfs Dragon is probably still the best type. Even the shittiest Dragon-types are above-average Pokémon all around.
Favorite type: Ghost, no contest.
Curious: Why did you start the thread with an image of the TCG types?