Marriland's Advanced Pokédex Search is an extremely powerful search tool to help you find exactly the Pokémon you're looking for. It allows you to search all of the Pokémon in Pokémon Sword & Shield and filter them by the criteria you specify, as well as sort them by a number of factors. This Advanced Pokédex Search works only for Pokémon Sword & Shield! Older games are not currently supported and Pokémon not present in Pokémon Sword & Shield will not show up.
To use this tool, fill out any of the fields down below and then press the "Search" button at the bottom of all of the options. You should also be able to press Enter and it will update the table. It does not automatically refresh when you change any options, so you need to do one of these two things to update the table. If you run across any issues (I'm sure there will be plenty!), feel free to report them to @Marriland on Twitter.