>>12492936HP Ice is still common but Signal Beam has become popular and most opt to drop HP Ice for it.
Main reasons is when you look at the big dragons in OU most can be covered with a combination of Signal Beam and Shadowball or are neutral to electric. Whilst Signal Beam lets it do something resembling damage against T-tar and kill Celebitch outright. Then you have the common counters like Ferrothorn, Gastrodon who cockblock it all day no matter what it's running.
>>1293277The rule was more along the lines of only Pokemon which work inside and out of Trick Room could have them. If they did one for every random slow monster they could've gone on forever. There is a huge difference between Escavalier which wrecks shit even without TR and Druddigon who dies like a bitch.