The A-Exeggutor in the desert are definitely nice EXP farm and if ya run around chasing the mirage oasis in the meantime you can heal while you farm as I believe each oasis resets the A-Exeggutor
Good ass match, naganadel is crazy
https://replay.pokemonshowdown.com/gen7ou-662387016
THIS MAN GOT DUMPSTER'D
https://replay.pokemonshowdown.com/gen7ou-662404960