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Shiny Arcanine, Nidoqueen, and pic related.
They're all three my signature Pokémon. I bring my shiny Arcanine to most multis and it never really fails me. In other formats I usually have Nidoqueen on my team, and she's mighty reliable, hitting hard despite also being quite bulky.
Finally Stantler is an old favourite of mine. I've managed to make it useful in doubles, and it's at the heart of my VGC team. I'm always delighted when it surpasses my expectations, which happens in every other battle.