Lopunny

Mega Lopunny has quickly cemented itself as one of the best new Mega Evolutions in OU. Its excellent Speed tier enables it to outspeed most of the unboosted metagame, and it has access to two powerful STAB moves backed up by a very respectable base 136 Attack. Furthermore, Scrappy gives it perfect coverage with its STAB types alone (bar against Shedinja, which is extremely uncommon in OU), giving it two completely free slots where it can fit the likes of Fake Out, Power-Up Punch, Substitute, Ice Punch, and Encore. Its combination of Speed and power makes it an excellent tool to use against offensive teams, and its access to Power-Up Punch and Encore make it of use against more defensive teams too, and an immunity to Ghost and a resistance to Dark give it opportunities to switch into the likes of Gengar and Bisharp. However, Mega Lopunny struggles to break past many physically defensive Pokemon due to its lack of raw power and the large number of Pokemon that resist Fighting, which are often found on these types of teams. It is also rather frail, holding little defensive prowess due to its lack of bulk and resistances, and is easily worn down by residual damage from sources such as entry hazards and High Jump Kick recoil.