Azumarill

Azumarill presents itself as a highly versatile attacker for teams, able to fulfill a variety of roles. It is foremost one of the best setup sweepers in the metagame thanks to its access to both Aqua Jet and Belly Drum. This alone is enough to put pressure on your opponent right from Team Preview. Its good defensive stats and plentiful resistances also aid its ability to set up and allow it to be an effective switch-in when used with Assault Vest. Water / Fairy typing is additionally great offensively, as Fairy imparts good neutral coverage and Water deals with Fire-types and many popular Steel-types. Heatran is a notable example of this, as while it ordinarily has a great matchup against Fairies, it struggles against Azumarill. Azumarill's low Speed stat is somewhat of a weakness, as foes that resist or take little damage from Aqua Jet can prove to be problematic. However, this is something that can be patched up through the use of speed control such as Trick Room. Finally, while its weaknesses are few, they do still leave it threatened by Pokemon prominent in the metagame, such as Thundurus and Amoonguss.