Exeggutor

An excellent Special Attack stat, the enormous Base Power of Solar Beam, the coverage of Psyshock against specially defensive tanks such as Hariyama and Magmortar, and Sleep Powder to neutralize remaining threats all make Exeggutor a nightmare to deal with while sun is up. Meanwhile, its decent physical bulk lets it enter battle on certain attacks, such as Earthquake from Rhydon and Close Combat from Hariyama, alongside nice resistances to Aqua Jet and Mach Punch. However, vulnerability to Sucker Punch isn't great for a Chlorophyll sweeper and forces Exeggutor to rely on Sleep Powder more than it likes, and its low special bulk ensures it takes heavy damage from even strong resisted attacks such as Samurott's Hydro Pump (outside of sun) and Choice Specs Mesprit's Psychic. Exeggutor's low base Speed also means that it requires full Sunny Day support to function more effectively than Shiftry on the average team and makes it easy to deal with outside of sun when combined with its multiple weaknesses, including a crippling 4x weakness to Bug-type attacks such as U-turn and a weakness to Pursuit from Pokemon such as Skuntank and Liepard. Furthermore, even during sun, Exeggutor can be outsped by Choice Scarf users such as Jynx and Rotom. Overall, Exeggutor requires a lot of team support to be more effective than other Grass-types in this metagame but is arguably the most dangerous Chlorophyll user due to its immense power and coverage. Other sets are generally better left to faster wallbreakers such as Shiftry or less vulnerable defensive Grass-types such as Vileplume.