Medicham

Mega Medicham's great Attack stat along with its ability, Pure Power, allows it to break Pokemon like Ferrothorn, non-Choice Scarf Landorus-T, Genesect, and non-Choice Scarf Dragonite, and the combination of Fake Out and reliable coverage moves enables it to break Sturdy and Multiscale from Pokemon like Magnezone and Dragonite along with taking out Pokemon like Genesect, Mega Venusaur, and non-Choice Scarf Landorus-T. However, Mega Medicham has trouble with faster Pokemon and common Choice Scarf users such as Mega Blaziken, Greninja, Porygon-Z, and Jirachi because its bulk makes it unable to take a hit from these Pokemon. It struggles with bulky Psychic- and Ghost-type Pokemon such as Tapu Lele, Mega Slowbro, Aegislash, and Mega Gengar, as it either fails to do damage to them or gets outstalled. Mega Medicham cannot get past walls like Mega Sableye and Clefable because they can take its attacks and slowly wear down its health. Mega Medicham also struggles to settle on one nature to use, as it needs an Adamant nature to consistently beat bulkier Pokemon like Zygarde-C and Zapdos but will no longer be able to outpace Tapu Lele and Normalium Z Porygon-Z without a Jolly nature.