Klefki, one of the newest Pokémon characters, is also one of the weirdest. It's a set of keys, with an immunity to poison and dragon-type moves. You probably can't open doors with it, but Tony Sarkees on Etsy is selling nickel-coated steel replicas of it. Much easier to put them in your pockets than a plush stuffed Pikachu.
Klefki Steel Keyring [Etsy, via Tiny Cartridge]
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