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Chansey with maxed out defense IVs and EVs with a positive nature has 119 defense. With the new candies, you can add +200 to that stat which gives you 319 defense. For reference, that's a few points higher than Garchomp's maxed out Defense.
At 319 Defense, a maxed out Machamp's Superpower does 320-380 damage to Chansey before stat drops. If Chansey's health is maxed out and given the candy buff, that's 35-41% damage. All of this is ignoring the friendship buffs, which apparently boost your stats even further.
What the fuck were they thinking? Stat boosts this powerful make it damn near impossible to lose to NPCs, or to other players who haven't grinded out candies. Masuda complained about breeding being so tedious, then adds another feature you have to grind out to be competitive with other players? Who is this feature supposed to benefit? What's the point?