Nurse Joy, eat your heart out: Pokemon professor creates a ridiculous strategy to heal the maximum amount of health in a single turn by using a dizzying loop of ejector seats

gamesradar.com:

Pokemon battles are generally all about dealing as much damage as possible, and maybe that's why I'd never given much thought to how much damage you could possibly heal on a single turn, but it turns out that it's way more than you might expect.

In a new deep-dive video on YouTube, content creator King The Luck proves that you can go far beyond healing a single health bar's worth of hit points if you're smart enough, by depleting and replenishing it repeatedly. First though, you'll need a loyal Blissey – a cute, pink Normal-type that just so happens to have the largest possible pool of health at 714HP, and must unfortunately have several near-death experiences for this to work.

King The Luck's optimal plan calls for a Double Battle format. On their team, as well as the Blissey, which has already been brought down to 1HP, they have three Smeargles – two set up Healing Wish and Lunar Dance to fully heal whichever ailing Pokemon gets switched into the right side of the field. The third Smeargle uses Metal Sound to cause a stat drop on Blissey, and then Role Play to copy the Hospitality ability from an opposing Sinistcha, which heals ally Pokemon by 25% when it's switched in. 

The opposing team also has a Smeargle, and both sides must use the move Sticky Web to lower the speed of any Pokemon switched in. Then, the final stages of setup see the enemy Smeargle use Doom Desire to essentially schedule some damage, while King The Luck's own Smeargle uses Wish to grant a heal at the end of the following turn. 

After that, the chaos begins. King The Luck's Smeargle uses Ally Switch to swap places with the almost-dead Blissey, triggering Healing Wish. Then, the opposing Sinistcha brings Blissey back down to 2HP using the move Leaf Storm, but because Sinistcha is holding an Eject Pack, the debuff it receives from its attack switches it out, and into a Galarian Weezing. Weezing's ability, Neutralizing Gas, which is meant to nullify abilities, sort of has the opposite effect here,