Its evolutionary process, requiring a Protector item and trade, adds a layer of complexity and exclusivity, making it a sought-after Pokmon among trainers
Between that and a Continuous Traps to put people behind, its either a midrange deck or control deck, depending on what the player wants
Or you can just block the attackers a few times and get multiple Fogs from it in addition to the tempo
Not all seven have to be on the field or in the Graveyard, if you have some on the field and some in the Graveyard, it's still able to be summoned which is very handy
You get their personal teams, including Mistys Starmie, Brocks Onix, Surges Electabuzz, all labeled and loyal