Genesect

Genesect has a good Special Attack stat to back up its diverse movepool. This, along with its STAB moves, allows it to take care of many Water- and Psychic-types like Mega Gyarados, Meloetta, and Mega Slowbro. Also, Genesect's typing allows it to resist Fairy-type moves from Pokemon like Mega Diancie. Its ability Download can make Genesect gain an additional Special Attack boost if the foe has lower Special Defense than Defense and is useful to get KOs it could not get otherwise against Pokemon such as Tapu Fini. Because of Genesect's movepool, it is tricky for the opponent to predict what coverage Genesect is running. However, Fire-types like Mega Charizard Y and Heatran give Genesect trouble. Genesect is easily KOed by neutral or super effective Z-Moves from Pokemon like Zeraora and Aegislash, as Genesect is often too frail to win matchups where it is outsped or it is not strong enough to KO the opponent. Steel-types such as Aegislash and Magearna give Genesect competition due to having more bulk and Special Attack without relying on Download for the right boost.