What happens when you hack a Pokemon to have Multitype?

Question

Let's say:

Magikarp (M) @ Flame Plate
Trait: Multitype

Will Magikarp turn into Fire type?

Comments

Pretty sure it'd change.
For another Example, you can teach Magikarp Thunder, and it could still use it.

Answer 1

Yes. But that only happens if you are good at hacking pokemon, or else the game will freeze when you look at magikarp's info in your team. Or use him in battle.

Answer 2

Yeah.
I just tested.