User blog comment:Zergrinch/All about Shipping/@comment-5128792-20121029184725/@comment-34954086-20121030144959

Nah at least at the later gens, the type cancelling does happen. You can have 4x Super Effective as is the case with say Fire/Flying types against Rock... There's also immunity now, Ghost/Normal, Electric/Ground etc.

Psychic types are still fairly substantially overpowered, but for this reason I typically have fairly powerful bug and dark types. Especially trollworthy against ghost types: use a raticate with crunch. No ghost type attacks can harm you and dark supereffective on ghost.