Chansey: Exists: Type Null: Oh crud
It doesn't get much support moves, no reliable recovery, and is outclassed by Chansey in every way in Nat Dex AG. Chansey gets great support moves in Stealth Rock, Heal Bell, Teleport, Softboiled, Toxic, Confide, Thunder Wave, and more I probably am not thinking about. Type Null, gets U-Turn, a move that a lot of things have, Toxic, a move literally everything has, Rest, a pretty crud move that is only used on it because of it getting no recovery, Sleep Talk so it won't be useless when asleep, Thunder Wave, which a lot of things have well, Magic Coat, a move that is gimmicky, Roar, a move that can have better Pokemon using it, and yeah, that's it. I can't think of any other support moves that are good on it. Type Nullsucks in a tier called PU. PU Pokemon are all bad, and it sucks in a tier named PU. Wait, I forgot to mention that Type Null is pretty bad in ZU, only at C rank. ZU stands for ZeroUsed, it is pretty bad in a tier named ZeroUsed, like, just please don't use it.