My Charizard obviously has a Charizardite X because this is a monotype Dragon team. A personal rule for me is to only use dragons. I have my own reasons, but mainly it's because I want to win with my favorite type and prove to myself that it can be done, even against teams without such restrictions. He carries Dragon Claw, Roost, Flare Blitz and Swords Dance. He is the cornerstone of my team, and in order to make my team truly mono type, I always send him out first, and mega evolve him on the first turn.
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