DexTeam
DexTeam checks a Pokémon team for the thing that actually loses battles: a weakness every member shares. It counts abilities such as Levitate, Water Absorb and Flash Fire rather than types alone, reads coverage from the moves actually selected, and suggests the swaps that close the gap. It covers 14 games including Pokémon Champions and Scarlet/Violet, imports and exports Showdown format, and also includes a damage calculator and Nuzlocke tools. It is free, needs no sign-up or download, and runs in the browser. DexTeam is an unofficial fan tool and is not affiliated with Nintendo, Game Freak or The Pokémon Company.