(Sorry about the english, it isn't my native language)
I think a Crest who turns Ambipom into a Special Attacker could be really interesting. Ambipom can learn some really interesting special moves, such as:
Grass Knot, Solar Beam, Thunderbolt, Thunder, Shadow Ball, Swift, Uproar, Water Pulse, Hidden Power (which can be anything), Dream Eater, Shock Wave and Mud-Slap (which can be useful for supporting roles, or with Z-Move)
And if it isn't enough, he also can learn Nasty Plot by level up, he has a lot of coverage options and a way to buff his SP.Attack, but it's all useless with his Special Attack Stat being so bad.
I think a Crest like Typhlosion's could fix that, or a Crest that just swaps the Special Attack stat with the Attack stat.
