PokéBase - Pokémon Q&A
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If you use it on a single type, it becomes dual type. If used on a double type, it becomes a triple type Pokemon. All this move does is add the ghost type to the Pokemon you use this move on.

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so does that mean you can somehow become more than 5 times weak?
Yes its possible unless you use it on a pokemon that's already a ghost type.
So, what if a pokemon uses Trick or Treat on a protean Greninja and Greninja uses say a water type move? Will Greninja be a Water/Ghost type or a pure water type?
that is a question on it's own, you should ask it!