Abilities and Contests?

Question

I want to use a Mega Sharpedo for contests, but before I do I need to know if his
Ability matters. I have a Rough Skin Sharpedo now, but I want to know if Speed Boost will have any additional effects in a Contest.

Answer 1

Abilities don't have effect during Contests

Only a Pokemon's primary type has an effect when you hit 5 stars

If you manage to hit the fifth star and fill the Excite Meter in your appeal, you will get a special bonus animation, based on your Pokémon's type, as well which gives you a lot more points.

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Sharpedo does well in Tough Contests

Sharpedo@Yellow Scarf
-Crunch
-Rain Dance
-Waterfall
-Thrash