Porygon2

Porygon2's Eviolite-boosted bulk allows it to withstand attacks from Pokemon like Mega Metagross, Garchomp, and Landorus-T. It also has a good movepool and a great ability in Analytic. This allows it to take care of faster Dragon- and Steel-types like non-Choice Band Haxorus and Mega Metagross. However, Porygon2 can be taken down by Pokemon like Sawk and Mega Lopunny because of their high Attack stats and super effective STAB moves. It also has a hard time against strong special attackers with boosting moves like Mega Gardevoir and Magearna, as they are able to tank Porygon2's attacks and OHKO it with their STAB moves after setting up. Furthermore, Porygon2 struggles against Taunt users like Tapu Fini and Deoxys-S, as they cut off its recovery, making it easier to knock out or outlast. Porygon2 also has trouble with bulky Pokemon like Mega Venusaur and Mega Sableye because of their immunity to Toxic and ability to outstall it.