Chansey

Like Blissey in every way, Chansey has made herself popular in gym defense, serving mainly to buy time for gym holders. Her significantly lower Atk and Def make her much less threatening than her big sister, but she is a great choice if stalling is the goal. Besides, Chansey’s extremely low CP gives her a slower motivation decay rate, which may make her even more powerful than Blissey after an extended period of time.

Best PvE Offensive Moveset

Don't even think about it. Just don't.

Best PvE Defensive Moveset

• Zen Headbutt slightly outperforms Pound. Zen Headbutt has better type coverage, deals more damage, and generates energy more quickly on defense.

• Dazzling Gleam hits more frequently and is effective against some of her best counters: Dragonite, Tyranitar, and Machamp.

• A battle against Chansey lasts shorter than one against Blissey, therefore Hyper Beam will be used less. Not only that, it's easy to consistently dodge.

• Psychic is good, but Dazzling Gleam does the same but better.

• Despite being a two-bar move, Psybeam deals little damage while also being easy to dodge. It's a worse Dazzling Gleam.

Pound and Zen Headbutt are two of the worst PvP fast moves in the entire game. Unexciting damage output combined with dreadful energy gains means you're gonna have to pick your poison. Pound gets STAB at least.

Dazzling Gleam performs better than Psychic for the same high 70 energy cost but offers slightly better coverage. Hyper Beam is known for being one of the slowest and hardest-hitting moves in the game, which also gets STAB with Chansey. 

While Psybeam is legacy, it is also one of the worst charge moves in the game, costing 60 energy and only returning an appalling 1.17 DPE (Damage Per Energy).