I discovered Pokémon rejuvenation when it was by V9 so i'm kinda new here....
Well, something fun happened to me when fighting Flora, the grass type gym leader, It was not so bad because i had my Charizard and then....She sends her Venusaur and mega evolve it. Ok, It was the only pokémon she had left and i still had two of my pokémon, but she always one-hit beated them. So, i burned her Mega Venusaur with the move ''Inferno'' from my Charizard, then she smashed my Charizard and i just had Lycanroc left, i was lost, but then i realized i had like 7 Revives, so, while Lycanroc was out, i Revived Charizard, Venusaur smashed Lycanroc but then her HP went down a little bit because of the burn, then i threw out my Charizard and Revived Lycanroc, she smashed my Charizard, then threw out Lycanroc and revive charizard before she killed my lycanroc but lose some HP, then Revive lycanroc and just repeated that until the burn killed his Venusaur, not much of a big deal i think, but it was pretty funny to me and intense too.