One of the most exciting cards in the Pokémon TCG: Sun & Moon—Cosmic Eclipse expansion is the TAG TEAM trio of Arceus & Dialga & Palkia-GX. Not only is it amazing to see these three mighty Legendary (and Mythical) Pokémon come together on one card, but the power they bring to your deck will have your opponents trembling in fear.
The most important tactic with this deck is to get Arceus & Dialga & Palkia-GX as your Active Pokémon as soon as possible and quickly use its Altered Creation-GX attack. This sets up a lasting effect that makes all your Pokémon's attacks do 30 more damage to your opponent’s Active Pokémon for the rest of the game. If you wait to use this GX attack until after you attach a Water Energy to this TAG TEAM trio, you'll get a bonus effect—an extra Prize card when you get a Knock Out with those boosted attacks!
After that, use Arceus & Dialga & Palkia-GX’s Ultimate Ray attack to do big damage and get 3 Energy from your deck onto your Pokémon. You can use Quagsire’s Wash Out Ability to move around any Water Energy, and its Hydro Pump attack can do big spurts of damage once you get enough Energy onto it. Naganadel’s Charging Up Ability lets you recover any basic Energy cards you might have lost along the way.
If you need some backup attackers, Volcanion , Mewtwo & Mew-GX, and Blastoise & Piplup-GX can all make a splash in different situations.