Extra hp glitch

When you start a battle, and you have few hp, when you click the extension, click on your bro mon (only works if you didn’t choose the bro mon you are using to fight this battle)(the bro mon your using to fight) and click choose, your bro mon regains max hp. I know I can exploit this but it ruins the game making any common bro mon have a higher chance in winning every battle.

whaaa???

can you explain more… better???

REALLY?
o way