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It depends on the region. Kanto has plenty of bugs, Johto has a bug catching contest. However, Fire types are rarely seen, like exotic animals. Poison should drop a tier or two, Zubat is the default Team Rocket option.
Anything Normal type/mammals (think rodents or small) should be the piss easy category if they behave like pet hamsters.
Small birds > fully evolved Flying Pokemon. Same for Water?