Know what hits hard.

In the paper TCG, each Pokémon card prints its own Weakness and Resistance. A Fire card is not automatically weak to Water just because that is true in the video games, so check the defending card instead of using the mainline row.

• Weakness uses the modifier printed on the card, often ×2.
• Resistance uses the amount printed on the card, often −30 in modern cards.
• There is no universal type immunity; Weakness and Resistance normally apply to the Active Pokémon, not the Bench.

GO keeps the same type relationships shown above, but it does not use 2× and ½× damage. Its effectiveness steps are:

So Normal → Ghost is 0× in the mainline games, but an immunity-style extra resistance in GO—not a true zero-damage hit. Dual-type modifiers still stack.