Hidden Power

The most common HP types I use are Fire and Flying, actually. Since Thundurus doesn't have access to any good special flying moves, HP Flying is really the best way to go. I used it for my VGC Nationals team back in 2013 haha

 

I use hidden power mostly on special attackers that don't have a very wide movepool like Jolteon, or on Pokémon that have a glaring weakness in their attack's typings. Getting a hidden power that's super effective against a Pokémon that usually walls you is pretty darn helpful in my opinion, like putting a hidden power ground on a fairy type. When I use it, I generally use Ground, Fire, or Ice type, though it really just depends on the Pokémon.

 

I pretty commonly use Hidden Power Fire. I just feel like nowadays, with Steel-Types being all over the place, its just too important. I usually use HP Fire Magnezone and Serperior, but I once used HP Fire Latios. Hidden Power Rock and Ground are nice surprises on Mons like Mega Pidgeot as well.

 

I quite often use Hidden Power, but I don't use it on the cartridge, since they can hard to remember, since unlike on the sims, the move selection doesn't display the type for your Hidden Power. The hidden power can be both predictable, and unpredictable, due to how it can be multiple types. If it hits your Magnezone for SE, it might either be Fire, Ground, or Fighting. Though Ground can be more obvious in that case, since it's 4x instead of 2x, but there are times when you can't really tell which type it is, ie. if the Magnezone was on low health.

On the Greninja, it's really obvious which type the hidden power is due to it's ability, Protean, transforming it to be same type as the hidden power.

 

I know you can determine what kind of HP you have on your Pokémon through some NPCs.
I don't use Hidden Power too often unless it's totally useful. I agree though, Magnet Pull + Hidden Power Fire on Magnezone is super OP. (I have one of these beauties on my cartridge. <3 )

But yeah, I feel like the majority of Pokémon probably has some sort of useful move to counter your counters. Hidden Power just is not as useful as these other moves, hence why I don't use it too much unless it's absolutely necessary to have via strategy.

 

I don't use hidden power, unless there's a type that I need in that set.

I use HP Dragon and HP Ice pretty frequently when I do use this move though~

 

Could you tell me why you use HP Dragon? Only valid reason I can think of is for the Hidden Type. (One of the smogon's OM's, All Pokémon gain extra type based on their Hidden Power's type)
Other than that, HP Ice is a lot better than HP Dragon, since it gives better coverage, unless you need to hit Mega Charizard X, Kingdra, and Kyurem for 2x, but still want to keep 2x for the most Dragon types.