Dragon types have specific weaknesses that vary slightly depending on the game version, but the core, widely accepted weaknesses across most modern Pokémon games are:

• Fairy-type moves
• Ice-type moves
• Dragon-type moves (Dragon itself)

In many generations, Dragon types were weak to Dragon, Ice, and Fairy moves. Since Generation VI onward, Fairy-type moves became a notable additional weakness for Dragons, reinforcing that Dragon types are particularly vulnerable to Fairy and Ice, with Dragon itself still being a weakness in various matchups depending on dual typings. Fire, Water, Grass, and Electric resistances are common among Dragon types, reducing damage from those elements. If you’d like, I can tailor this to a specific game generation or format (main series games vs. Pokémon GO) and provide a quick reference chart for single- and dual-type Dragons.