Happy New Year
lemonstre1!!
I tried a few times to make Chimecho work, and I had marginal success with Trick + Disable so that's what I ended up using for this team. I also tried Charm + Disable and speed control + Encore + Disable as well, but they weren't as good. Chimecho OHKOes no bulk Urshifu (dark forme) and isn't OHKOed by (non-offensive item) Sucker Punch. I tried to cover the meta fairly well with 2 fun Pokemon to go with it.
I decided I needed to attempt to beat some brokens with AV Greninja, since Chimecho beats precisely 0 top tiers. It beats (non-stall) Meloetta with Shadow Sheak (use sneak -> u-turn -> u-turn) and generally covers stuff like Hoopa-U / Darkrai that Chimecho can't beat v reliably thanks to Protean U-turn and Low Kick. You should beat Primarina with Gunk Shot -> Shadow Sneak. Low Kick is for some Archaludon, but it can be swapped for a Dark-type move or something like Ice Beam if you wish.
Primarina covers the main threats to Greninja, mainly Iron Valiant, Regidrago, Gouging Fire. It also happens to make a monowater core for extra
Christmas New Year's magic. It worked
okay on ladder and I hope you enjoy it. If you're interested I'll send the mono-water team I make out of this when I finish it as well