In the manga, he tricks the gang into thinking he's switched sides after his defeat in the Monster World RPG
The key is to understand the benefits, the costs, and which of your cards are the best candidates for grading
Another indirect tool would also come for Atlantean Mermail in the form of Knightmare Mermaid due to it being a WATER Link-1 whose discard could trigger your Atlanteans while you could potentially get the opponent under a Knightmare Corruptor Iblee lock and Extra Link, along with adding additional hand rips on top of Moulinglacia the Elemental Lord as Galaxy Tomahawk allowing for so much Link shenanigans meant you could run Topologic Gumblar Dragon
2 Ability Shady Move Once during your turn (before your attack) , if this Pokmon is your Active Pokmon, you may move 1 damage counter from 1 Pokmon to another Pokmon
Drakuseth, Maw of Flames can come crashing in and cause wanton destruction, dealing damage to enough targets to cause a tectonic shift in the games balance
Those moves are pretty decent too Magby lets you put a Fire energy on a benched Basic Pokmon, Elekid does 20 damage to any of your opponents benched Pokmon, Cleffa lets you draw a random Pokmon card from your deck, and Smoochum does 20 damage for each energy attached to your opponents Pokmon