@Shu_Ah Sorry for missing your post on Discord.

As you have to use multiple Pokémon games of different versions, the category can't be added to this board.

However, you can ask for it to be added to the Multiple Pokémon Games board, which is made for this.

In fact, the category already exists there with the same rules but made in Coop by 2 players : https://www.speedrun.com/multiple_pokemon_games?h=Catch_em_all-gen-5-unova-dex-2-players&x=q257o1gd-j84kmk2n.lmo869m1