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This fucker.
>2% catch rate on Mt. Pyre peak in grass most people just walk past
>single form with none(?) being used by a trainer during a playthrough
>likely the last Pokémon you would need to complete the dex
At least you encounter Milotic in trainer battles which would at least pique your interest, Chimecho doesn't even have a trace of it existing apart from that one patch of grass. And then it becomes a semi-rare run-of-the-mill Pokémon in Gen IV with a common pre-evolution.
It seems like Gen III had a ton of strategy guide bait, with the Regi puzzle, Feebas catching, Chimecho and most of all Mirage Island.(which 99.99% wouldn't ever see anyway)