Belly Drum smeargle is a fantastic lure to nearly all of its counters although it still requires pursuit support unless you run knock off (you're smacked by gastly anyway so I prefer sacred fire) no natu, arceus, or pretty much all non ghost/rock types really like switching into smeargle. Trust me on calcs cause they are really hard to do 9.9. Anyways down to the meat of the post I wanted to bring up two mons that I find are really good. First, semi outclassed by smeargle is delibird, the santa bird is tired of getting laughed at and now is a really viable mon. I have been using it as an anti lead with fake out being able to break sashs and destiny bond to get a free kill, the things it has over smeargle are a sleep immunity and actual offensive prescence(non bd that is) but in a lot of ways it is outclassed however it will shine after a potential smeargle ban. Ok now onto the other mon which is another commonly shat upon mon: shedinja. Shedinja is a great pivot for any team being able to force a multitude of switches via wonder guard. Yeah it forces you to run hazard removal and most likely a cleric but with the amount of momentum you get from shedinja it is still really good. You can also run will o wisp to cripple physical attackers that want to come in. It can also kill off weakened things with shadow sneak off its base 180 attack which is really impressive although most of the time you will be clicking baton pass. All in all I feel that shedinja and delibird (although kinda outclassed for the time being) and shedinja are two very underrated pokemon in the 350 cup metagame and highly recommend you at least try them out!