Venusaur

With a seemingly average defensive and offensive typing, Mega Venusaur may not seem like much, and, to be fair, this instantaneous critique isn't completely unjust. Mega Venusaur's defensive typing leaves it weak to the relatively common Flying- and Psychic-type moves in the OU metagame, which makes Mega Venusaur a liability when facing many common OU threats, including Latios, Mega Metagross, Mega Alakazam, Talonflame, and Tornadus-T, while its offensive typing makes it easily switched into by prevalent bulky Steel-types such as Jirachi, Mega Metagross, and Heatran. Furthermore, as a Mega Evolution, Mega Venusaur lacks Leftovers recovery, and, as a Pokemon with only Synthesis for reliable recovery, it is heavily hurt by sand and rain as well as entry hazards, thus making up a Pokemon very easily worn down.

Nevertheless, because of Mega Venusaur's defensive and offensive capabilities, it is a standard Pokemon on stall, balanced, and bulky offensive teams. Its defensive typing is perhaps its biggest asset, giving it resistances to Fighting-, Grass-, Water-, Electric-, and Fairy-type moves, and in tandem with its ability Thick Fat and impeccable bulk, it allows Mega Venusaur to check many common threats in OU, including Keldeo, Mega Altaria, Azumarill, Pursuit Bisharp, Clefable, Mega Diancie, Mega Gyarados, Landorus-T, Mega Lopunny, Ferrothorn, and Mega Manectric. Mega Venusaur is also relatively versatile, capable of running an offensive set, more suited to switching into and checking foes with offensive force, or a defensive set that is used more for hard walling threats.