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Depends on the region, but assuming we can completely ignore that, then I'd want a Scorpion and a Spider, just something similar, but would have a sort of grandiose design considering it's legendaries to give something more to the Arachnid Pokemon. Could be Grass and Ice and have a sort of Ice Age idea to it, despite being arachnids, shows their tenacity in surviving.
Either that or something involving fossil Pokemon, a Triceratops and a Mosasaurus, maybe the theme could be Land/Sea like Groudon/Kyogre in a way.