I've actually just created a sun team that uses Choice Specs Rotom-H and it's pretty effective. Overheat absolutely murders anything that doesn't resist it and is not made of pink bubble gum, Volt Switch mantains momentum, and Trick means that Chansey and Blissey aren't completely safe. The other slot is filler, I am running Hidden Power Rock just to have a backup attack against Volcarona and is my strongest attack against Dragon-types as well.
Before somebody says that Victini is more effective, Rotom-H's Fire STAB doesn't lower its defenses and speed, also Rotom-H is not weak to Pursuit and neutral to U-Turn, and has much more great resistances than Victini, and gets STAB on the Electric-type attack.
I am starting to play Yu-Gi-Oh! again and I am looking for people who can battle alongside me and my friend Roberto, we are trying to learn to play on the Yu-Gi-Oh! metagame, I have a Dark World deck and I want to improve my skills, if anyone of you are Yu-Gi-Oh! players, please contact me on my personal page.