What type of damage is ditto immune to?

Ditto is a NORMAL type Pokémon that first appeared in Generation I (it is one of the original 151, Pokédex entry 132). Ditto has no evolution line but can breed with any pokemon in a Day Care Center.

Ditto is weak to Fighting type (2x), immune to Ghost type (0x) and resistant to none. However, it should be noted that if Ditto is given a Ring Target, Ghost-type moves effectiveness is 1x; and if Ditto transforms into another Pokémon, type effectiveness depends on the type of the Pokémon he transformed into.

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