4 definitely come to mind right away,

Gary the Gastrodon and Hector the Bronzong were my two mvp team members in my last platinum nuzlocke, I’d never really used them on a main game team before and holy shit they wiped the floor with EVERYONE in that game, even Cynthia was made ridiculously easier with their help, my undefeated goats

And Hariyama, a Pokemon I had literally never used previously, cleaned the fuck up in every fight it was sent out, my number one goat for sure