17.
I remember, back in the day, I tried to raise one because it lacked weaknesses as long as it isn't facing Mold Breaker or gets grounded. However, this thing has many issues. For one, its stats are weird. It is really slow, but has good offensive stats. This sounds like it would be a capable bulky attacker, but it turns out that it doesn't have good defensive stats that allow it to tank hits. That means it would take some serious damage before it gets to attack because of its horrible Speed. For that, it seems like it could only excel in Trick Room, but much better options exist for Trick Room. Rotom is much better than this thing in every possible way.