What is the Pokémon that has the highest base EXP?

Question

So these could include Audino, Snorlax or any. Which is it? And where to catch it is every game possible?

Answer 1

Generation 1: Chansey (RBY: Cerulean Cave)
Generations 2 to 3: Chansey (GSC: routes 13 to 15) and Blissey
Generation 4: Chansey (DPPt: routes 209 to 210, Trophy Garden, HGSS: routes 13 to 15), Blissey, Happiny (DPPt: Trophy Garden), Arceus
Generations 5 to 7: Blissey (USM: Poni Plains)
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source: experience