I'd have to sign up for Pokémon Showdown and come up with a good team. If anyone wants to give me tips, so far, I've got:

Alolan Golem

Charizard

Gyarados

Arcanine

Kartana

Blastoise

Dragonite

I'm going for high base stats, high base power moves (with some stat boosters), and type advantages.

This year's theme is Saved from the Cutting Room Floor!

Hal the Metagross
Kilauea the Volcanion
Regina the Honchkrow
Aramis the Virizon
Altaria (can mega evolve)
Bambi the Sawsbuck

Reserve: Ibuki the Toxicroak

You’ve given the rules of engagement, if you will, but not the actual mechanics. I’m curious, but unclear as to how these battles actually play out.

I've got to admit, I have spent hours since this post went up trying to think up a new team to play this year. Then, about fifteen minutes ago I went. "Why create a new team, I won last time we did standard rules." And so with a few minor tweaks I present to you my OU team.

First up, the one, the only. The unbeatable MAMOSWINE!
Second. You know it, you hate it. He'll wash you up. It's ROTOM-W!
Thirdly, this one will sweep you under once again. It's ALAKAZAM!
Next up, a new face, a new force. KARTANA!
Fifth to step up will have you hot under the collar. That's right, HEATRAN is here to stay!
Reminding you not to mess with Fairies, a new 'mon is here. It's MEGA ALTARIA!
And finally, the Snowy Substitute you'd best not mess with. It's ALOLAN NINETALES!

...I might have got a bit too excited

Novastorme.

P.S Warning this may change at some point prior to the 4th April.

Victini
Gliscor
Lucario
Ninetales-Alola
Scizor
Chansey

Substitute: Crobat

My combatants are as follows:

Young Volcanoes (Heatran)
Rubberband Man (M-Venusaur)
Back in Black (Greninja)
Stay Frosty Royal Milk Tea (Mamoswine)
Magia (Magearna)
Icarus (Tornadus-T)

A sub may come along soon, however today is not that day.

Introducing Team Watercolour Challenge:-

Black Wave (Greninja)
Crimson Tide (Toxapex)
Purple Rain (Swampert)
Sea Green (Pelipper)
Blue Dog (Suicune)
Lavender Water (Tapu Fini)
Substitute: Muddy Waters (Gastrodon)

Not only is it a mono-Water team, they're also all different colours! TASTE THE RAINBOW. TASTE IT. GET IT IN YOUR MOUTH AND LET THE TASTING HAPPEN. YOU CANNOT STOP IT. YOU CAN ONLY HOPE TO CONTAIN IT.

Primarina
Garchomp
Volcarona
Weavile
Crobat
Aggron
No substitute... for now. Might change my mind, but I've never used one in the past so it seems pointless for me to do it now.

I think I'll take a gander at it this year. :)

Battler: S.M.F!

Pokémon: Togekiss (Marisa), Altaria (no nickname), Espeon (Rafael), Torchic (Rachel), Porygon (Webmind), Vaporeon (Nautilus), and Umbreon (Bobo).

No special items for me, or Megas.