Kangaskhan

Mega Kangaskhan is not only one of the best choices for a Mega Evolution but also one of the strongest Pokemon in the format. Its base 100 Speed allows it to outrun the majority of unboosted Pokemon. Its access to Fake Out and Sucker Punch means that even foes that outspeed it aren't necessarily problematic. Fake Out also provides excellent support to a variety of Pokemon, making Mega Kangaskhan more of a team player than most other offensive powerhouses. Its additional access to coverage options like Fire Punch and Hammer Arm can make it unpredictable to deal with. The aforementioned moves combined with its incredible ability, Parental Bond, and access to high Base Power moves like Double-Edge let Mega Kangaskhan outright OHKO many foes, including Focus Sash users such as Smeargle and Thundurus. However, Parental Bond worsens its matchup against foes like Iron Barbs Ferrothorn or those with Rocky Helmet. Finally, Mega Kangaskhan's Normal typing grants it very few resistances, making it difficult to switch in without taking an undesirable amount of damage.