I'm going to nom chansey to A-. I legitimately thought this thing was already somewhere in A but was surprised to find it in B+. Chansey has the luxury of eating up any special attack in the game and even some strong physical hits. If all your physical attackers are dead and your opponent's chansey is still alive you might as well just click X. This mon checks so many things it's ridiculous. You don't even have to worry about focus blasts because they do nothing anyway. As long as you know the opponent is using a special move all you gotta do is click chansey. It's also difficult to wear down chansey with status because of heal bell and natural cure. There's no question why this monster is crucial to stall teams.
Once you're in on a special attacker you are free to do pretty much anything. It can Thunderwave/Toxic to cripple things (which discourages physical mons to switch in), get up rocks, clear status from your team, softboiled or seismic toss to do a decent amount of damage.
However chansey is kinda easy to predict and taunt shuts it down, but it's reliability and sheer ability to EASILY tank any special attack warrants it a spot in A- imo. I hardly ever use chansey but I see it all the time on the ladder and it's so annoying to deal with it.
Everyone knows the power of this thing but im gonna post some calcs anyway using the 4 hp 252 def 252 spdef set.
252 SpA Mega Alakazam Focus Blast vs. 4 HP / 252 SpD Eviolite Chansey: 168-198 (26.1 - 30.8%) -- 23.6% chance to 3HKO after Stealth Rock
32 Atk Mega Diancie Diamond Storm vs. 4 HP / 252+ Def Eviolite Chansey: 220-259 (34.2 - 40.3%) -- guaranteed 3HKO after Stealth Rock
252 SpA Mega Charizard Y Fire Blast vs. 4 HP / 252 SpD Eviolite Chansey in Sun: 160-190 (24.9 - 29.5%) -- 0.5% chance to 3HKO after Stealth Rock
252 SpA Life Orb Latios Draco Meteor vs. 4 HP / 252 SpD Eviolite Chansey: 142-168(22.1 - 26.1%) -- guaranteed 4HKO after Stealth Rock
+3 252 SpA Manaphy Scald vs. 4 HP / 252 SpD Eviolite Chansey: 139-165 (21.6 - 25.7%) -- 100% chance to 4HKO after Stealth Rock
32 Atk Mega Diancie Diamond Storm vs. 4 HP / 252+ Def Eviolite Chansey: 220-259 (34.2 - 40.3%) -- guaranteed 3HKO after Stealth Rock
252 SpA Mega Charizard Y Fire Blast vs. 4 HP / 252 SpD Eviolite Chansey in Sun: 160-190 (24.9 - 29.5%) -- 0.5% chance to 3HKO after Stealth Rock
252 SpA Life Orb Latios Draco Meteor vs. 4 HP / 252 SpD Eviolite Chansey: 142-168(22.1 - 26.1%) -- guaranteed 4HKO after Stealth Rock
+3 252 SpA Manaphy Scald vs. 4 HP / 252 SpD Eviolite Chansey: 139-165 (21.6 - 25.7%) -- 100% chance to 4HKO after Stealth Rock
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