Rotom!

[Sheep]

Rotom has a few different forms! Which is your favorite?

 

[Devalue]

Mow Rotom. Imagines that attacking easier than, say, a refrigerator. Places base Rotom second.

 

[Alex_Among_Foxes]

(tempted to post the toilet duck again, but I'll be serious for a change lol)
For me it's the basic form. Though I do like the design of the fan form as well.

 

[Sweet Serenity]

In battle, Rotom is tried and true. You can't go wrong having one on your team. However, Rotom Fan is probably the most useless one since it still has Levitate despite being part Flying-type because of the fan. Regardless, my favorite Rotom form isn't even one of these battle forms. My favorite is the Pokédex form in the Generation 7 games because it keeps you company throughout your journey. It even gives you Roto Powers, which were awesome. Before Generation 7, I didn't care much about Rotom, but those games made me feel differently about it.

 

[Lavender]

the fridge one is so goofy and I love him.

 

[Explorer of Time]

I quite like Heat Rotom. With only Rock and Water as weaknesses, eight resistances, and a Ground immunity, it has an excellent defensive typing, and it gets access to Volt Switch to get a hit in whenever it has to switch out from Overheat's special attack debuff.

I like all of the other forms too, except Wash Rotom. (I don't like using low-accuracy moves if I can help it, and Hydro Pump only has 80 accuracy. At least Blizzard hits consistently on hail teams, which I probably have already if I'm using Frost Rotom in the first place.)

 

[ReKoil]

Base form Rotom.
Never really used the appliance forms.

 

[Zeostar]

The wash machine. Water/Electric is amazing. On top of that, levitate covers the electric weakness.

 

[Nah]

Still have some fondness for Rotom-W from my competitive battle days since it had a stretch of time where it was very good (idk how it fares these days).
Fan Rotom for the meme
Heat/Toaster Oven Rotom is nice too