the idea isn't very viable, ZardX needs speed EVs to not get ruined by Lando, Terrakion, Metagross...that's of course, if you want it to be a sweeper. A wallbreaker, on the other hand, might be a little more viable. A fire type not weak to water and with bulk means it could switch into scalds easier and set up on the likes of Slowbro, utility starmie etc.