RE: Trick Room Rain
sup noobs
jk..mk so here we go. I can't believe it's been this long since I found the vcg part of the forum. I'm really damn good at this stuff (I am, very very experienced...) so yeah, let's jump into it.
assuming regular smogon ladder:
for your idea, rain trick room, it must revolve around element of surprise (as you mentioned). Having a couple usually fast sweepers involved is key
You can ask me what I think would be good EV spread/etc/moveset later
1) Politoed because obvious. Also make everything -speed nature (obv)
2) Ferrothron/Forretress-screw tentacruel for entry hazards/spin support. Either of these 2 are better, but you only get one. It's really a pick your poison option. If I had to choose I'd pick forretress since rapid spin + better typing (bug steel is probably one of the best typings in the game you can get)...and because of rain and sturdy, you can laugh at fire moves...(well not exactly...but you can sponge fighting moves better too)
3) Magnezone. You need a Pokemon that counters scizor that's not named Jellicent. Plus it helps hit other water types...and no one uses swampert anymore.
4) Personally I'd use Vaporeon as your 2nd and final support Pokemon. Just use it as if you would 4th gen, but with scald and not surf.
5) You have no physical attackers. Use scizor. It's naturally slow, BP still gets priority, and it's just...GOOD. I slap scizor on almost every team I make no matter the theme because it just has that much utility. And this acts as your decoy pokemon.
6) Now look at your team. What pokemon would absolutely Stolen it (if it was just the 5)? What comes to my mind is Conkeldurr/Machamp/any big fighting type that's not Terrakion. Use Slowbro here. It sets up trick room, and counters it.
Have fun and lmk how it goes w/ laddering. This is, of course, a VERY basic prototype. You can be creative (but not stupid) with the movesets. lmk if you need help though.