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Chansey's monstrous HP and high Special Defense stats make it the bulkiest special wall in the tier, boasting the ability to reliably handle the majority of the special attackers that the OU tier has to offer. To further accentuate its defensive prowess, Chansey has access to a plethora of viable utility moves such as Stealth Rock, Toxic, Thunder Wave, and Heal Bell, which makes it a must on almost all stall teams. On the flipside, while Chansey's measly Defense stat is covered for by its gargantuan HP stat combined with heavy EV investment, Chansey is still overwhelmed by physical attackers with setup moves such as Swords Dance Landorus-T and Kartana. Chansey's defensive typing is also interesting; while a Normal typing grants it only a single weakness, it also means Chansey has no resistances and only a single immunity. Furthermore, as is the case for many defensive Pokemon, Chansey is relatively slow and somewhat passive, relying heavily on Seismic Toss or status moves in order to inflict damage, meaning it can be relatively easily exploited by a number of offensive Pokemon. Lastly, Chansey is heavily reliant on Eviolite, as without it, Chansey is significantly less bulky and greatly struggles to check some of the more powerful offensive threats that it is usually tasked to handle.
