I've proposed that for the purposes of the tier list, the game can be completed in whatever way is convenient for the Pokemon you are arguing for. So that means that if you want to get Surf and Chansey before you even fight Erika, there's nothing stopping you. AFAIK nobody explicitely agreed with me (though some people used this line of thought for their arguments, eg whoever argued in Omanyte's favor), but nobody disagreed either.
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