It's versatile and can be built in many different ways, emphasizing more aggro or defensive styles of play, or even producing a deck that doesnt really need to attack at all if played right
Below are the steps for building a custom deck in the Pokmon TCG Online
While it technically picks up after the manga ends, it serves as an ending for these parts of the franchise lore
If you don't, put it into your hand
While I do wish I could fit in a copy of Abyss Dweller somewhere simply for its ability to shut down entire strategies, even options like that just arent in the cards sometimes for a primary Extra Deck, so as a player, you need to prioritize what is most important to you
Its also a fantastic enabler for anything that cares about filling your graveyard quickly