Your Pokmon deck should contain three main types of cards: Pokmon, Energy, and Trainer.
Think affinity, combo, or even just good-stuff artifact decksMox Opal smooths out your colors while it speeds you up
Any Simic (blue/green) token deck will want to run Adrix and Nev, Twincasters and any Orzhov (white/black) token deck will want to include Kaya, Geist Hunter
However Yuamu began discarding cards that didn't fit her Deck, revealing she snuck a booster pack into her Deck before Yuhi lit the arena, and she summoned "Red-Boot Boost Dragon", whose DARK Attribute and effect to return her monsters to her Deck countered Sky's "Golondrinas Prison", allowing her to defeat them
With just about every card available to a deck builder, Commander is truly a blank canvas, and any idea is at least worth trying out
GR Gold Rare Eater of Millions X DARK Level 1 [ FiendEffect ] ATK